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How can I figure out this question about install port using pip

I want to install the package port.The OS is Mac OS 10.15.6. The terminal showed these error:
(base) bash-3.2$ pip install port
Collecting port
Using cached port-1.1.4-py3-none-any.whl
Collecting pyrss2gen
Using cached PyRSS2Gen-1.1-py3-none-any.whl
Requirement already satisfied: python-dateutil in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from port) (2.8.1)
Requirement already satisfied: pyyaml in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from port) (5.4.1)
Requirement already satisfied: watchdog==0.8.3 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from port) (0.8.3)
Collecting nom
Using cached nom-1.4.0-py3-none-any.whl
Collecting click==6.2
Using cached click-6.2-py2.py3-none-any.whl (70 kB)
Requirement already satisfied: argh>=0.24.1 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from watchdog==0.8.3->port) (0.26.2)
Requirement already satisfied: pathtools>=0.1.1 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from watchdog==0.8.3->port) (0.1.2)
Collecting Jinja2==2.8
Using cached Jinja2-2.8-py2.py3-none-any.whl (263 kB)
Requirement already satisfied: Pygments==2.1.3 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from nom->port) (2.1.3)
Requirement already satisfied: Markdown==2.6.5 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from nom->port) (2.6.5)
Collecting html2text==2015.11.4
Using cached html2text-2015.11.4-py3-none-any.whl
Collecting lxml==3.5.0
Using cached lxml-3.5.0.tar.gz (3.8 MB)
Requirement already satisfied: websocket-server==0.4 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from nom->port) (0.4)
Collecting gfm==0.0.3
Using cached gfm-0.0.3-py3-none-any.whl
Requirement already satisfied: py-gfm==0.1.1 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from nom->port) (0.1.1)
Requirement already satisfied: MarkupSafe in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from Jinja2==2.8->nom->port) (1.1.1)
Requirement already satisfied: setuptools in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from py-gfm==0.1.1->nom->port) (47.1.0)
Requirement already satisfied: unittest2 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from py-gfm==0.1.1->nom->port) (1.1.0)
Requirement already satisfied: six>=1.5 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from python-dateutil->port) (1.15.0)
Requirement already satisfied: traceback2 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from unittest2->py-gfm==0.1.1->nom->port) (1.4.0)
Collecting argparse
Using cached argparse-1.4.0-py2.py3-none-any.whl (23 kB)
Requirement already satisfied: linecache2 in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (from traceback2->unittest2->py-gfm==0.1.1->nom->port) (1.0.0)
Building wheels for collected packages: lxml
Building wheel for lxml (setup.py) ... error
ERROR: Command errored out with exit status 1:
command: /usr/local/bin/python3.7 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/2m/5c6f3dp53939057p3xz0ys1c0000gn/T/pip-install-2bbhvpwz/lxml_3ae795971a7a4a38adceb54ead864a4e/setup.py'"'"'; __file__='"'"'/private/var/folders/2m/5c6f3dp53939057p3xz0ys1c0000gn/T/pip-install-2bbhvpwz/lxml_3ae795971a7a4a38adceb54ead864a4e/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' bdist_wheel -d /private/var/folders/2m/5c6f3dp53939057p3xz0ys1c0000gn/T/pip-wheel-if_aavgp
cwd: /private/var/folders/2m/5c6f3dp53939057p3xz0ys1c0000gn/T/pip-install-2bbhvpwz/lxml_3ae795971a7a4a38adceb54ead864a4e/
Complete output (85 lines):
Building lxml version 3.5.0.
Building without Cython.
Using build configuration of libxslt 1.1.29
Building against libxml2/libxslt in the following directory: /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib
running bdist_wheel
running build
running build_py
creating build
creating build/lib.macosx-10.9-x86_64-3.7
creating build/lib.macosx-10.9-x86_64-3.7/lxml
copying src/lxml/_elementpath.py -> build/lib.macosx-10.9-x86_64-3.7/lxml
copying src/lxml/sax.py -> build/lib.macosx-10.9-x86_64-3.7/lxml
copying src/lxml/pyclasslookup.py -> build/lib.macosx-10.9-x86_64-3.7/lxml
copying src/lxml/__init__.py -> build/lib.macosx-10.9-x86_64-3.7/lxml
copying src/lxml/builder.py -> build/lib.macosx-10.9-x86_64-3.7/lxml
copying src/lxml/doctestcompare.py -> build/lib.macosx-10.9-x86_64-3.7/lxml
copying src/lxml/usedoctest.py -> build/lib.macosx-10.9-x86_64-3.7/lxml
copying src/lxml/cssselect.py -> build/lib.macosx-10.9-x86_64-3.7/lxml
copying src/lxml/ElementInclude.py -> build/lib.macosx-10.9-x86_64-3.7/lxml
creating build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/__init__.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
creating build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/soupparser.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/defs.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/_setmixin.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/clean.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/_diffcommand.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/html5parser.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/__init__.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/formfill.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/builder.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/ElementSoup.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/_html5builder.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/usedoctest.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/diff.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
creating build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron
copying src/lxml/isoschematron/__init__.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron
copying src/lxml/lxml.etree.h -> build/lib.macosx-10.9-x86_64-3.7/lxml
copying src/lxml/lxml.etree_api.h -> build/lib.macosx-10.9-x86_64-3.7/lxml
copying src/lxml/includes/xmlerror.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/c14n.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/xmlschema.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/schematron.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/tree.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/uri.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/etreepublic.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/xpath.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/htmlparser.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/xslt.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/config.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/xmlparser.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/xinclude.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/dtdvalid.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/relaxng.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/lxml-version.h -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/etree_defs.h -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
creating build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources
creating build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/rng
copying src/lxml/isoschematron/resources/rng/iso-schematron.rng -> build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/rng
creating build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/xsl
copying src/lxml/isoschematron/resources/xsl/XSD2Schtrn.xsl -> build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/xsl
copying src/lxml/isoschematron/resources/xsl/RNG2Schtrn.xsl -> build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/xsl
creating build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_abstract_expand.xsl -> build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_dsdl_include.xsl -> build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_schematron_skeleton_for_xslt1.xsl -> build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_svrl_for_xslt1.xsl -> build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_schematron_message.xsl -> build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/readme.txt -> build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
running build_ext
building 'lxml.etree' extension
creating build/temp.macosx-10.9-x86_64-3.7
creating build/temp.macosx-10.9-x86_64-3.7/src
creating build/temp.macosx-10.9-x86_64-3.7/src/lxml
/usr/local/bin/gcc-9 -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -I/usr/local/opt/openblas/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -Isrc/lxml/includes -I/Library/Frameworks/Python.framework/Versions/3.7/include/python3.7m -c src/lxml/lxml.etree.c -o build/temp.macosx-10.9-x86_64-3.7/src/lxml/lxml.etree.o -w -flat_namespace
unable to execute '/usr/local/bin/gcc-9': No such file or directory
Compile failed: command '/usr/local/bin/gcc-9' failed with exit status 1
creating var
creating var/folders
creating var/folders/2m
creating var/folders/2m/5c6f3dp53939057p3xz0ys1c0000gn
creating var/folders/2m/5c6f3dp53939057p3xz0ys1c0000gn/T
cc -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -I/usr/include/libxml2 -c /var/folders/2m/5c6f3dp53939057p3xz0ys1c0000gn/T/xmlXPathInitze9cdjlm.c -o var/folders/2m/5c6f3dp53939057p3xz0ys1c0000gn/T/xmlXPathInitze9cdjlm.o
cc var/folders/2m/5c6f3dp53939057p3xz0ys1c0000gn/T/xmlXPathInitze9cdjlm.o -L/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib -lxml2 -o a.out
error: command '/usr/local/bin/gcc-9' failed with exit status 1
----------------------------------------
ERROR: Failed building wheel for lxml
Running setup.py clean for lxml
Failed to build lxml
Installing collected packages: argparse, lxml, Jinja2, html2text, gfm, click, pyrss2gen, nom, port
Attempting uninstall: lxml
Found existing installation: lxml 4.6.2
Uninstalling lxml-4.6.2:
Successfully uninstalled lxml-4.6.2
Running setup.py install for lxml ... error
ERROR: Command errored out with exit status 1:
command: /usr/local/bin/python3.7 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/2m/5c6f3dp53939057p3xz0ys1c0000gn/T/pip-install-2bbhvpwz/lxml_3ae795971a7a4a38adceb54ead864a4e/setup.py'"'"'; __file__='"'"'/private/var/folders/2m/5c6f3dp53939057p3xz0ys1c0000gn/T/pip-install-2bbhvpwz/lxml_3ae795971a7a4a38adceb54ead864a4e/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /private/var/folders/2m/5c6f3dp53939057p3xz0ys1c0000gn/T/pip-record-ol8yht6w/install-record.txt --single-version-externally-managed --compile --install-headers /Library/Frameworks/Python.framework/Versions/3.7/include/python3.7m/lxml
cwd: /private/var/folders/2m/5c6f3dp53939057p3xz0ys1c0000gn/T/pip-install-2bbhvpwz/lxml_3ae795971a7a4a38adceb54ead864a4e/
Complete output (80 lines):
Building lxml version 3.5.0.
Building without Cython.
Using build configuration of libxslt 1.1.29
Building against libxml2/libxslt in the following directory: /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib
running install
running build
running build_py
creating build
creating build/lib.macosx-10.9-x86_64-3.7
creating build/lib.macosx-10.9-x86_64-3.7/lxml
copying src/lxml/_elementpath.py -> build/lib.macosx-10.9-x86_64-3.7/lxml
copying src/lxml/sax.py -> build/lib.macosx-10.9-x86_64-3.7/lxml
copying src/lxml/pyclasslookup.py -> build/lib.macosx-10.9-x86_64-3.7/lxml
copying src/lxml/__init__.py -> build/lib.macosx-10.9-x86_64-3.7/lxml
copying src/lxml/builder.py -> build/lib.macosx-10.9-x86_64-3.7/lxml
copying src/lxml/doctestcompare.py -> build/lib.macosx-10.9-x86_64-3.7/lxml
copying src/lxml/usedoctest.py -> build/lib.macosx-10.9-x86_64-3.7/lxml
copying src/lxml/cssselect.py -> build/lib.macosx-10.9-x86_64-3.7/lxml
copying src/lxml/ElementInclude.py -> build/lib.macosx-10.9-x86_64-3.7/lxml
creating build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/__init__.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
creating build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/soupparser.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/defs.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/_setmixin.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/clean.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/_diffcommand.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/html5parser.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/__init__.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/formfill.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/builder.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/ElementSoup.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/_html5builder.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/usedoctest.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
copying src/lxml/html/diff.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/html
creating build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron
copying src/lxml/isoschematron/__init__.py -> build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron
copying src/lxml/lxml.etree.h -> build/lib.macosx-10.9-x86_64-3.7/lxml
copying src/lxml/lxml.etree_api.h -> build/lib.macosx-10.9-x86_64-3.7/lxml
copying src/lxml/includes/xmlerror.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/c14n.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/xmlschema.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/schematron.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/tree.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/uri.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/etreepublic.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/xpath.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/htmlparser.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/xslt.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/config.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/xmlparser.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/xinclude.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/dtdvalid.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/relaxng.pxd -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/lxml-version.h -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
copying src/lxml/includes/etree_defs.h -> build/lib.macosx-10.9-x86_64-3.7/lxml/includes
creating build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources
creating build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/rng
copying src/lxml/isoschematron/resources/rng/iso-schematron.rng -> build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/rng
creating build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/xsl
copying src/lxml/isoschematron/resources/xsl/XSD2Schtrn.xsl -> build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/xsl
copying src/lxml/isoschematron/resources/xsl/RNG2Schtrn.xsl -> build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/xsl
creating build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_abstract_expand.xsl -> build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_dsdl_include.xsl -> build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_schematron_skeleton_for_xslt1.xsl -> build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_svrl_for_xslt1.xsl -> build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_schematron_message.xsl -> build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/readme.txt -> build/lib.macosx-10.9-x86_64-3.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
running build_ext
building 'lxml.etree' extension
creating build/temp.macosx-10.9-x86_64-3.7
creating build/temp.macosx-10.9-x86_64-3.7/src
creating build/temp.macosx-10.9-x86_64-3.7/src/lxml
/usr/local/bin/gcc-9 -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -arch x86_64 -g -I/usr/local/opt/openblas/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -Isrc/lxml/includes -I/Library/Frameworks/Python.framework/Versions/3.7/include/python3.7m -c src/lxml/lxml.etree.c -o build/temp.macosx-10.9-x86_64-3.7/src/lxml/lxml.etree.o -w -flat_namespace
unable to execute '/usr/local/bin/gcc-9': No such file or directory
Compile failed: command '/usr/local/bin/gcc-9' failed with exit status 1
cc -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -I/usr/include/libxml2 -c /var/folders/2m/5c6f3dp53939057p3xz0ys1c0000gn/T/xmlXPathInitpxou4we_.c -o var/folders/2m/5c6f3dp53939057p3xz0ys1c0000gn/T/xmlXPathInitpxou4we_.o
cc var/folders/2m/5c6f3dp53939057p3xz0ys1c0000gn/T/xmlXPathInitpxou4we_.o -L/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib -lxml2 -o a.out
error: command '/usr/local/bin/gcc-9' failed with exit status 1
----------------------------------------
Rolling back uninstall of lxml
Moving to /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/lxml-4.6.2.dist-info/
from /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/~xml-4.6.2.dist-info
Moving to /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/lxml/
from /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/~xml
ERROR: Command errored out with exit status 1: /usr/local/bin/python3.7 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/2m/5c6f3dp53939057p3xz0ys1c0000gn/T/pip-install-2bbhvpwz/lxml_3ae795971a7a4a38adceb54ead864a4e/setup.py'"'"'; __file__='"'"'/private/var/folders/2m/5c6f3dp53939057p3xz0ys1c0000gn/T/pip-install-2bbhvpwz/lxml_3ae795971a7a4a38adceb54ead864a4e/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /private/var/folders/2m/5c6f3dp53939057p3xz0ys1c0000gn/T/pip-record-ol8yht6w/install-record.txt --single-version-externally-managed --compile --install-headers /Library/Frameworks/Python.framework/Versions/3.7/include/python3.7m/lxml Check the logs for full command output.

Installing Keras in pycharm causing failure

I am trying to use Keras for time series forecasting and I stumbled across an error while installing Keras lib.
Here is an error message that I got:
Collecting keras
Using cached Keras-2.4.3-py2.py3-none-any.whl (36 kB)
Requirement already satisfied: numpy>=1.9.1 in e:\program files (x86)\pythonworkspace\r&dproject\venv\lib\site-packages (from keras) (1.20.1)
Collecting h5py
Using cached h5py-3.2.1.tar.gz (368 kB)
Installing build dependencies: started
Installing build dependencies: finished with status 'done'
Getting requirements to build wheel: started
Getting requirements to build wheel: finished with status 'done'
Installing backend dependencies: started
Installing backend dependencies: finished with status 'done'
Preparing wheel metadata: started
Preparing wheel metadata: finished with status 'done'
Requirement already satisfied: scipy>=0.14 in e:\program files (x86)\pythonworkspace\r&dproject\venv\lib\site-packages (from keras) (1.6.1)
Collecting pyyaml
Using cached PyYAML-5.4.1-cp38-cp38-win32.whl (196 kB)
Building wheels for collected packages: h5py
Building wheel for h5py (PEP 517): started
Building wheel for h5py (PEP 517): finished with status 'error'
Failed to build h5py
DEPRECATION: The -b/--build/--build-dir/--build-directory option is deprecated and has no effect anymore. pip 21.1 will remove support for this functionality. A possible replacement is use the TMPDIR/TEMP/TMP environment variable, possibly combined with --no-clean. You can find discussion regarding this at https://github.com/pypa/pip/issues/8333.
ERROR: Command errored out with exit status 1:
command: 'E:\Program Files (x86)\PythonWorkspace\R&DProject\venv\Scripts\python.exe' 'E:\Program Files (x86)\PythonWorkspace\R&DProject\venv\lib\site-packages\pip\_vendor\pep517\_in_process.py' build_wheel 'C:\Users\Pdani\AppData\Local\Temp\tmp3bkex0vs'
cwd: C:\Users\Pdani\AppData\Local\Temp\pip-install-ohk956w8\h5py_04e48a12b76742f58110ae0bdae41c39
Complete output (73 lines):
running bdist_wheel
running build
running build_py
creating build
creating build\lib.win32-3.8
creating build\lib.win32-3.8\h5py
copying h5py\h5py_warnings.py -> build\lib.win32-3.8\h5py
copying h5py\ipy_completer.py -> build\lib.win32-3.8\h5py
copying h5py\version.py -> build\lib.win32-3.8\h5py
copying h5py\__init__.py -> build\lib.win32-3.8\h5py
creating build\lib.win32-3.8\h5py\_hl
copying h5py\_hl\attrs.py -> build\lib.win32-3.8\h5py\_hl
copying h5py\_hl\base.py -> build\lib.win32-3.8\h5py\_hl
copying h5py\_hl\compat.py -> build\lib.win32-3.8\h5py\_hl
copying h5py\_hl\dataset.py -> build\lib.win32-3.8\h5py\_hl
copying h5py\_hl\datatype.py -> build\lib.win32-3.8\h5py\_hl
copying h5py\_hl\dims.py -> build\lib.win32-3.8\h5py\_hl
copying h5py\_hl\files.py -> build\lib.win32-3.8\h5py\_hl
copying h5py\_hl\filters.py -> build\lib.win32-3.8\h5py\_hl
copying h5py\_hl\group.py -> build\lib.win32-3.8\h5py\_hl
copying h5py\_hl\selections.py -> build\lib.win32-3.8\h5py\_hl
copying h5py\_hl\selections2.py -> build\lib.win32-3.8\h5py\_hl
copying h5py\_hl\vds.py -> build\lib.win32-3.8\h5py\_hl
copying h5py\_hl\__init__.py -> build\lib.win32-3.8\h5py\_hl
creating build\lib.win32-3.8\h5py\tests
copying h5py\tests\common.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\conftest.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_attribute_create.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_attrs.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_attrs_data.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_base.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_big_endian_file.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_completions.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_dataset.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_dataset_getitem.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_dataset_swmr.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_datatype.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_dimension_scales.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_dims_dimensionproxy.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_dtype.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_errors.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_file.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_file2.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_file_image.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_filters.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_group.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_h5.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_h5d_direct_chunk.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_h5f.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_h5o.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_h5p.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_h5pl.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_h5t.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_objects.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_selections.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\test_slicing.py -> build\lib.win32-3.8\h5py\tests
copying h5py\tests\__init__.py -> build\lib.win32-3.8\h5py\tests
creating build\lib.win32-3.8\h5py\tests\data_files
copying h5py\tests\data_files\__init__.py -> build\lib.win32-3.8\h5py\tests\data_files
creating build\lib.win32-3.8\h5py\tests\test_vds
copying h5py\tests\test_vds\test_highlevel_vds.py -> build\lib.win32-3.8\h5py\tests\test_vds
copying h5py\tests\test_vds\test_lowlevel_vds.py -> build\lib.win32-3.8\h5py\tests\test_vds
copying h5py\tests\test_vds\test_virtual_source.py -> build\lib.win32-3.8\h5py\tests\test_vds
copying h5py\tests\test_vds\__init__.py -> build\lib.win32-3.8\h5py\tests\test_vds
copying h5py\tests\data_files\vlen_string_dset.h5 -> build\lib.win32-3.8\h5py\tests\data_files
copying h5py\tests\data_files\vlen_string_dset_utc.h5 -> build\lib.win32-3.8\h5py\tests\data_files
copying h5py\tests\data_files\vlen_string_s390x.h5 -> build\lib.win32-3.8\h5py\tests\data_files
warning: build_py: byte-compiling is disabled, skipping.
running build_ext
Loading library to get build settings and version: hdf5.dll
error: Unable to load dependency HDF5, make sure HDF5 is installed properly
error: Could not find module 'hdf5.dll' (or one of its dependencies). Try using the full path with constructor syntax.
----------------------------------------
ERROR: Failed building wheel for h5py
ERROR: Could not build wheels for h5py which use PEP 517 and cannot be installed directly
I already tried different solutions like downgrading my Python interpreter from 3.9 to 3.7, updating pip to a newer version, but nothing worked so far. Now I'm totally stucked.

Make sure you have 64bit python install.
This error can be because of old pip version. Upgrade pip:
pip3 install --upgrade pip
then try to install h5py directly:
pip install h5py
And reinstall Keras:
pip install keras

Install kivy Python 3.8.3 [duplicate]

This question already has answers here:
How to deal with Kivy installing error in Python 3.8?
(5 answers)
Closed 2 years ago.
I am trying to install Kivy in python 3.8.3 following all instrucions of kivy page instalation, so when i put this command:
python -m pip install kivy==1.11.1
The terminal shows me this error:
C:\Users\SAGASTUME>python -m pip install kivy==1.11.1
Collecting kivy==1.11.1
Using cached Kivy-1.11.1.tar.gz (23.6 MB)
Requirement already satisfied: Kivy-Garden>=0.1.4 in c:\users\sagastume\appdata\local\programs\python\python38-32\lib\site-packages (from kivy==1.11.1) (0.1.4)
Requirement already satisfied: docutils in c:\users\sagastume\appdata\local\programs\python\python38-32\lib\site-packages (from kivy==1.11.1) (0.16)
Requirement already satisfied: pygments in c:\users\sagastume\appdata\local\programs\python\python38-32\lib\site-packages (from kivy==1.11.1) (2.7.2)
Requirement already satisfied: requests in c:\users\sagastume\appdata\local\programs\python\python38-32\lib\site-packages (from Kivy-Garden>=0.1.4->kivy==1.11.1) (2.24.0)
Requirement already satisfied: idna<3,>=2.5 in c:\users\sagastume\appdata\local\programs\python\python38-32\lib\site-packages (from requests->Kivy-Garden>=0.1.4->kivy==1.11.1) (2.10)
Requirement already satisfied: chardet<4,>=3.0.2 in c:\users\sagastume\appdata\local\programs\python\python38-32\lib\site-packages (from requests->Kivy-Garden>=0.1.4->kivy==1.11.1) (3.0.4)
Requirement already satisfied: certifi>=2017.4.17 in c:\users\sagastume\appdata\local\programs\python\python38-32\lib\site-packages (from requests->Kivy-Garden>=0.1.4->kivy==1.11.1) (2020.6.20)
Requirement already satisfied: urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1 in c:\users\sagastume\appdata\local\programs\python\python38-32\lib\site-packages (from requests->Kivy-Garden>=0.1.4->kivy==1.11.1) (1.25.9)
Building wheels for collected packages: kivy
Building wheel for kivy (setup.py) ... error
ERROR: Command errored out with exit status 3221225477:
command: 'C:\Users\SAGASTUME\AppData\Local\Programs\Python\Python38-32\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\SAGASTUME\\AppData\\Local\\Temp\\pip-install-8mqblxk_\\kivy\\setup.py'"'"'; __file__='"'"'C:\\Users\\SAGASTUME\\AppData\\Local\\Temp\\pip-install-8mqblxk_\\kivy\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' bdist_wheel -d 'C:\Users\SAGASTUME\AppData\Local\Temp\pip-wheel-eb9bfmtx'
cwd: C:\Users\SAGASTUME\AppData\Local\Temp\pip-install-8mqblxk_\kivy\
Complete output (531 lines):
Using setuptools
User distribution detected, avoid portable command.
Using this graphics system: OpenGL
WARNING: A problem occurred while running pkg-config --libs --cflags gstreamer-1.0 (code 1)
b'"pkg-config" no se reconoce como un comando interno o externo,\r\nprograma o archivo por lotes ejecutable.\r\n'
WARNING: A problem occurred while running pkg-config --libs --cflags gstreamer-1.0 (code 1)
b'"pkg-config" no se reconoce como un comando interno o externo,\r\nprograma o archivo por lotes ejecutable.\r\n'
WARNING: A problem occurred while running pkg-config --libs --cflags sdl2 SDL2_ttf SDL2_image SDL2_mixer (code 1)
b'"pkg-config" no se reconoce como un comando interno o externo,\r\nprograma o archivo por lotes ejecutable.\r\n'
ERROR: Dependency for context.pyx not resolved: config.pxi
ERROR: Dependency for compiler.pyx not resolved: config.pxi
ERROR: Dependency for context_instructions.pyx not resolved: config.pxi
ERROR: Dependency for fbo.pyx not resolved: config.pxi
ERROR: Dependency for gl_instructions.pyx not resolved: config.pxi
ERROR: Dependency for instructions.pyx not resolved: config.pxi
ERROR: Dependency for opengl.pyx not resolved: config.pxi
ERROR: Dependency for opengl_utils.pyx not resolved: config.pxi
ERROR: Dependency for shader.pyx not resolved: config.pxi
ERROR: Dependency for stencil_instructions.pyx not resolved: config.pxi
ERROR: Dependency for scissor_instructions.pyx not resolved: config.pxi
ERROR: Dependency for texture.pyx not resolved: config.pxi
ERROR: Dependency for vbo.pyx not resolved: config.pxi
ERROR: Dependency for vertex.pyx not resolved: config.pxi
ERROR: Dependency for vertex_instructions.pyx not resolved: config.pxi
ERROR: Dependency for cgl.pyx not resolved: config.pxi
ERROR: Dependency for cgl_mock.pyx not resolved: config.pxi
ERROR: Dependency for cgl_gl.pyx not resolved: config.pxi
ERROR: Dependency for cgl_glew.pyx not resolved: config.pxi
ERROR: Dependency for cgl_sdl2.pyx not resolved: config.pxi
ERROR: Dependency for svg.pyx not resolved: config.pxi
fatal: not a git repository (or any of the parent directories): .git
running bdist_wheel
running build
running build_py
creating build
creating build\lib.win32-3.8
creating build\lib.win32-3.8\kivy
copying kivy\animation.py -> build\lib.win32-3.8\kivy
copying kivy\app.py -> build\lib.win32-3.8\kivy
copying kivy\atlas.py -> build\lib.win32-3.8\kivy
copying kivy\base.py -> build\lib.win32-3.8\kivy
copying kivy\cache.py -> build\lib.win32-3.8\kivy
copying kivy\clock.py -> build\lib.win32-3.8\kivy
copying kivy\compat.py -> build\lib.win32-3.8\kivy
copying kivy\config.py -> build\lib.win32-3.8\kivy
copying kivy\context.py -> build\lib.win32-3.8\kivy
copying kivy\event.py -> build\lib.win32-3.8\kivy
copying kivy\factory.py -> build\lib.win32-3.8\kivy
copying kivy\factory_registers.py -> build\lib.win32-3.8\kivy
copying kivy\geometry.py -> build\lib.win32-3.8\kivy
copying kivy\gesture.py -> build\lib.win32-3.8\kivy
copying kivy\interactive.py -> build\lib.win32-3.8\kivy
copying kivy\loader.py -> build\lib.win32-3.8\kivy
copying kivy\logger.py -> build\lib.win32-3.8\kivy
copying kivy\metrics.py -> build\lib.win32-3.8\kivy
copying kivy\multistroke.py -> build\lib.win32-3.8\kivy
copying kivy\parser.py -> build\lib.win32-3.8\kivy
copying kivy\resources.py -> build\lib.win32-3.8\kivy
copying kivy\support.py -> build\lib.win32-3.8\kivy
copying kivy\utils.py -> build\lib.win32-3.8\kivy
copying kivy\vector.py -> build\lib.win32-3.8\kivy
copying kivy\version.py -> build\lib.win32-3.8\kivy
copying kivy\weakmethod.py -> build\lib.win32-3.8\kivy
copying kivy\__init__.py -> build\lib.win32-3.8\kivy
creating build\lib.win32-3.8\kivy\core
copying kivy\core\__init__.py -> build\lib.win32-3.8\kivy\core
creating build\lib.win32-3.8\kivy\core\audio
copying kivy\core\audio\audio_avplayer.py -> build\lib.win32-3.8\kivy\core\audio
copying kivy\core\audio\audio_ffpyplayer.py -> build\lib.win32-3.8\kivy\core\audio
copying kivy\core\audio\audio_gstplayer.py -> build\lib.win32-3.8\kivy\core\audio
copying kivy\core\audio\audio_pygame.py -> build\lib.win32-3.8\kivy\core\audio
copying kivy\core\audio\__init__.py -> build\lib.win32-3.8\kivy\core\audio
creating build\lib.win32-3.8\kivy\core\camera
copying kivy\core\camera\camera_android.py -> build\lib.win32-3.8\kivy\core\camera
copying kivy\core\camera\camera_gi.py -> build\lib.win32-3.8\kivy\core\camera
copying kivy\core\camera\camera_opencv.py -> build\lib.win32-3.8\kivy\core\camera
copying kivy\core\camera\camera_picamera.py -> build\lib.win32-3.8\kivy\core\camera
copying kivy\core\camera\__init__.py -> build\lib.win32-3.8\kivy\core\camera
creating build\lib.win32-3.8\kivy\core\clipboard
copying kivy\core\clipboard\clipboard_android.py -> build\lib.win32-3.8\kivy\core\clipboard
copying kivy\core\clipboard\clipboard_dbusklipper.py -> build\lib.win32-3.8\kivy\core\clipboard
copying kivy\core\clipboard\clipboard_dummy.py -> build\lib.win32-3.8\kivy\core\clipboard
copying kivy\core\clipboard\clipboard_gtk3.py -> build\lib.win32-3.8\kivy\core\clipboard
copying kivy\core\clipboard\clipboard_nspaste.py -> build\lib.win32-3.8\kivy\core\clipboard
copying kivy\core\clipboard\clipboard_pygame.py -> build\lib.win32-3.8\kivy\core\clipboard
copying kivy\core\clipboard\clipboard_sdl2.py -> build\lib.win32-3.8\kivy\core\clipboard
copying kivy\core\clipboard\clipboard_winctypes.py -> build\lib.win32-3.8\kivy\core\clipboard
copying kivy\graphics\tesselator.pxd -> build\lib.win32-3.8\kivy\graphics
copying kivy\graphics\texture.pxd -> build\lib.win32-3.8\kivy\graphics
copying kivy\graphics\transformation.pxd -> build\lib.win32-3.8\kivy\graphics
copying kivy\graphics\vbo.pxd -> build\lib.win32-3.8\kivy\graphics
copying kivy\graphics\vertex.pxd -> build\lib.win32-3.8\kivy\graphics
copying kivy\graphics\vertex_instructions.pxd -> build\lib.win32-3.8\kivy\graphics
copying kivy\graphics\common.pxi -> build\lib.win32-3.8\kivy\graphics
copying kivy\graphics\gl_debug_logger.pxi -> build\lib.win32-3.8\kivy\graphics
copying kivy\graphics\img_tools.pxi -> build\lib.win32-3.8\kivy\graphics
copying kivy\graphics\memory.pxi -> build\lib.win32-3.8\kivy\graphics
copying kivy\graphics\opcodes.pxi -> build\lib.win32-3.8\kivy\graphics
copying kivy\graphics\opengl_utils_def.pxi -> build\lib.win32-3.8\kivy\graphics
copying kivy\graphics\vertex_instructions_line.pxi -> build\lib.win32-3.8\kivy\graphics
creating build\lib.win32-3.8\kivy\include
copying kivy\include\common_subset.h -> build\lib.win32-3.8\kivy\include
copying kivy\include\gl2platform.h -> build\lib.win32-3.8\kivy\include
copying kivy\include\gl_redirect.h -> build\lib.win32-3.8\kivy\include
copying kivy\include\khrplatform.h -> build\lib.win32-3.8\kivy\include
copying kivy\lib\vidcore_lite\bcm.pxd -> build\lib.win32-3.8\kivy\lib\vidcore_lite
creating build\lib.win32-3.8\kivy\data
copying kivy\data\style.kv -> build\lib.win32-3.8\kivy\data
copying kivy\data\settings_kivy.json -> build\lib.win32-3.8\kivy\data
creating build\lib.win32-3.8\kivy\data\fonts
copying kivy\data\fonts\DejaVuSans.ttf -> build\lib.win32-3.8\kivy\data\fonts
copying kivy\data\fonts\Roboto-Bold.ttf -> build\lib.win32-3.8\kivy\data\fonts
copying kivy\data\fonts\Roboto-BoldItalic.ttf -> build\lib.win32-3.8\kivy\data\fonts
copying kivy\data\fonts\Roboto-Italic.ttf -> build\lib.win32-3.8\kivy\data\fonts
copying kivy\data\fonts\Roboto-Regular.ttf -> build\lib.win32-3.8\kivy\data\fonts
copying kivy\data\fonts\RobotoMono-Regular.ttf -> build\lib.win32-3.8\kivy\data\fonts
creating build\lib.win32-3.8\kivy\data\images
copying kivy\data\images\cursor.png -> build\lib.win32-3.8\kivy\data\images
copying kivy\data\images\defaultshape.png -> build\lib.win32-3.8\kivy\data\images
copying kivy\data\images\defaulttheme-0.png -> build\lib.win32-3.8\kivy\data\images
copying kivy\data\images\testpattern.png -> build\lib.win32-3.8\kivy\data\images
copying kivy\data\images\background.jpg -> build\lib.win32-3.8\kivy\data\images
copying kivy\data\images\image-loading.gif -> build\lib.win32-3.8\kivy\data\images
copying kivy\data\images\defaulttheme.atlas -> build\lib.win32-3.8\kivy\data\images
creating build\lib.win32-3.8\kivy\data\keyboards
copying kivy\data\keyboards\azerty.json -> build\lib.win32-3.8\kivy\data\keyboards
copying kivy\data\keyboards\de.json -> build\lib.win32-3.8\kivy\data\keyboards
copying kivy\data\keyboards\de_CH.json -> build\lib.win32-3.8\kivy\data\keyboards
copying kivy\data\keyboards\en_US.json -> build\lib.win32-3.8\kivy\data\keyboards
copying kivy\data\keyboards\fr_CH.json -> build\lib.win32-3.8\kivy\data\keyboards
copying kivy\data\keyboards\qwerty.json -> build\lib.win32-3.8\kivy\data\keyboards
copying kivy\data\keyboards\qwertz.json -> build\lib.win32-3.8\kivy\data\keyboards
creating build\lib.win32-3.8\kivy\data\glsl
copying kivy\data\glsl\default.png -> build\lib.win32-3.8\kivy\data\glsl
copying kivy\data\glsl\default.vs -> build\lib.win32-3.8\kivy\data\glsl
copying kivy\data\glsl\header.vs -> build\lib.win32-3.8\kivy\data\glsl
copying kivy\data\glsl\default.fs -> build\lib.win32-3.8\kivy\data\glsl
copying kivy\data\glsl\header.fs -> build\lib.win32-3.8\kivy\data\glsl
copying kivy\tests\unicode_files.zip -> build\lib.win32-3.8\kivy\tests
copying kivy\tests\unicode_font.zip -> build\lib.win32-3.8\kivy\tests
copying kivy\tests\testkv.kv -> build\lib.win32-3.8\kivy\tests
copying kivy\tests\test_button.png -> build\lib.win32-3.8\kivy\tests
copying kivy\tests\sample1.ogg -> build\lib.win32-3.8\kivy\tests
creating build\lib.win32-3.8\kivy\tools\gles_compat
copying kivy\tools\gles_compat\gl2.h -> build\lib.win32-3.8\kivy\tools\gles_compat
creating build\lib.win32-3.8\kivy\tools\pep8checker
copying kivy\tools\pep8checker\pep8.py -> build\lib.win32-3.8\kivy\tools\pep8checker
copying kivy\tools\pep8checker\pep8kivy.py -> build\lib.win32-3.8\kivy\tools\pep8checker
copying kivy\tools\pep8checker\pre-commit.githook -> build\lib.win32-3.8\kivy\tools\pep8checker
creating build\lib.win32-3.8\kivy\tools\theming
creating build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\action_bar.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\action_group.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\action_group_disabled.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\action_group_down.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\action_item.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\action_item_down.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\action_view.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\audio-volume-high.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\audio-volume-low.png -> build\lib.win32
copying kivy\tools\theming\defaulttheme\sliderv_background_disabled.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\slider_cursor.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\slider_cursor_disabled.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\spinner.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\spinner_disabled.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\spinner_pressed.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\splitter.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\splitter_disabled.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\splitter_disabled_down.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\splitter_disabled_down_h.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\splitter_disabled_h.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\splitter_down.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\splitter_down_h.png -> build\lib.win32-
copying kivy\tools\theming\defaulttheme\textinput_disabled_active.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\tree_closed.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\tree_opened.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\vkeyboard_background.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\vkeyboard_disabled_background.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\vkeyboard_disabled_key_down.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\vkeyboard_disabled_key_normal.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\vkeyboard_key_down.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\vkeyboard_key_normal.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
running build_ext
----------------------------------------
ERROR: Failed building wheel for kivy
Running setup.py clean for kivy
Failed to build kivy
Installing collected packages: kivy
Running setup.py install for kivy ... error
ERROR: Command errored out with exit status 3221225477:
command: 'C:\Users\SAGASTUME\AppData\Local\Programs\Python\Python38-32\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\SAGASTUME\\AppData\\Local\\Temp\\pip-install-8mqblxk_\\kivy\\setup.py'"'"'; __file__='"'"'C:\\Users\\SAGASTUME\\AppData\\Local\\Temp\\pip-install-8mqblxk_\\kivy\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record 'C:\Users\SAGASTUME\AppData\Local\Temp\pip-record-pvid_1bu\install-record.txt' --single-version-externally-managed --compile --install-headers 'C:\Users\SAGASTUME\AppData\Local\Programs\Python\Python38-32\Include\kivy'
cwd: C:\Users\SAGASTUME\AppData\Local\Temp\pip-install-8mqblxk_\kivy\
Complete output (513 lines):
Using setuptools
User distribution detected, avoid portable command.
Using this graphics system: OpenGL
WARNING: A problem occurred while running pkg-config --libs --cflags gstreamer-1.0 (code 1)
b'"pkg-config" no se reconoce como un comando interno o externo,\r\nprograma o archivo por lotes ejecutable.\r\n'
WARNING: A problem occurred while running pkg-config --libs --cflags gstreamer-1.0 (code 1)
b'"pkg-config" no se reconoce como un comando interno o externo,\r\nprograma o archivo por lotes ejecutable.\r\n'
WARNING: A problem occurred while running pkg-config --libs --cflags sdl2 SDL2_ttf SDL2_image SDL2_mixer (code 1)
b'"pkg-config" no se reconoce como un comando interno o externo,\r\nprograma o archivo por lotes ejecutable.\r\n'
fatal: not a git repository (or any of the parent directories): .git
running install
running build
running build_py
creating build
creating build\lib.win32-3.8
creating build\lib.win32-3.8\kivy
copying kivy\animation.py -> build\lib.win32-3.8\kivy
copying kivy\context.py -> build\lib.win32-3.8\kivy
copying kivy\event.py -> build\lib.win32-3.8\kivy
copying kivy\factory.py -> build\lib.win32-3.8\kivy
copying kivy\factory_registers.py -> build\lib.win32-3.8\kivy
copying kivy\geometry.py -> build\lib.win32-3.8\kivy
copying kivy\gesture.py -> build\lib.win32-3.8\kivy
copying kivy\core\window\window_egl_rpi.py -> build\lib.win32-3.8\kivy\core\window
copying kivy\core\window\window_pygame.py -> build\lib.win32-3.8\kivy\core\window
copying kivy\core\window\window_sdl2.py -> build\lib.win32-3.8\kivy\core\window
copying kivy\core\window\__init__.py -> build\lib.win32-3.8\kivy\core\window
creating build\lib.win32-3.8\kivy\deps
copying kivy\deps\__init__.py -> build\lib.win32-3.8\kivy\deps
creating build\lib.win32-3.8\kivy\effects
copying kivy\effects\dampedscroll.py -> build\lib.win32-3.8\kivy\effects
copying kivy\effects\kinetic.py -> build\lib.win32-3.8\kivy\effects
copying kivy\effects\opacityscroll.py -> build\lib.win32-3.8\kivy\effects
copying kivy\effects\scroll.py -> build\lib.win32-3.8\kivy\effects
copying kivy\effects\__init__.py -> build\lib.win32-3.8\kivy\effects
creating build\lib.win32-3.8\kivy\graphics
copying kivy\graphics\__init__.py -> build\lib.win32-3.8\kivy\graphics
creating build\lib.win32-3.8\kivy\graphics\cgl_backend
copying kivy\graphics\cgl_backend\__init__.py -> build\lib.win32-3.8\kivy\graphics\cgl_backend
creating build\lib.win32-3.8\kivy\garden
copying kivy\garden\__init__.py -> build\lib.win32-3.8\kivy\garden
creating build\lib.win32-3.8\kivy\input
copying kivy\input\factory.py -> build\lib.win32-3.8\kivy\input
copying kivy\tests\test_utils.py -> build\lib.win32-3.8\kivy\tests
copying kivy\tests\test_vector.py -> build\lib.win32-3.8\kivy\tests
copying kivy\tests\test_video.py -> build\lib.win32-3.8\kivy\tests
copying kivy\tests\test_widget.py -> build\lib.win32-3.8\kivy\tests
copying kivy\tests\test_widget_walk.py -> build\lib.win32-3.8\kivy\tests
copying kivy\tests\test_window_info.py -> build\lib.win32-3.8\kivy\tests
copying kivy\tests\visual_test_label.py -> build\lib.win32-3.8\kivy\tests
copying kivy\tests\__init__.py -> build\lib.win32-3.8\kivy\tests
creating build\lib.win32-3.8\kivy\tools
copying kivy\tools\benchmark.py -> build\lib.win32-3.8\kivy\tools
copying kivy\tools\changelog_parser.py -> build\lib.win32-3.8\kivy\tools
copying kivy\tools\generate-icons.py -> build\lib.win32-3.8\kivy\tools
copying kivy\tools\kviewer.py -> build\lib.win32-3.8\kivy\tools
copying kivy\tools\report.py -> build\lib.win32-3.8\kivy\tools
copying kivy\tools\stub-gl-debug.py -> build\lib.win32-3.8\kivy\tools
copying kivy\tools\texturecompress.py -> build\lib.win32-3.8\kivy\tools
copying kivy\tools\__init__.py -> build\lib.win32-3.8\kivy\tools
creating build\lib.win32-3.8\kivy\tools\packaging
copying kivy\tools\packaging\factory.py -> build\lib.win32-3.8\kivy\tools\packaging
copying kivy\tools\packaging\__init__.py -> build\lib.win32-3.8\kivy\tools\packaging
creating build\lib.win32-3.8\kivy\tools\packaging\pyinstaller_hooks
copying kivy\tools\packaging\pyinstaller_hooks\hook-kivy.py -> build\lib.win32-3.8\kivy\tools\packaging\pyinstaller_hooks
copying kivy\tools\packaging\pyinstaller_hooks\pyi_rth_kivy.py -> build\lib.win32-3.8\kivy\tools\packaging\pyinstaller_hooks
copying kivy\tools\packaging\pyinstaller_hooks\__init__.py -> build\lib.win32-3.8\kivy\tools\packaging\pyinstaller_hooks
copying kivy\tools\packaging\pyinstaller_hooks\__main__.py -> build\lib.win32-3.8\kivy\tools\packaging\pyinstaller_hooks
creating build\lib.win32-3.8\kivy\tools\highlight
copying kivy\tools\highlight\__init__.py -> build\lib.win32-3.8\kivy\tools\highlight
creating build\lib.win32-3.8\kivy\extras
copying kivy\extras\highlight.py -> build\lib.win32-3.8\kivy\extras
copying kivy\extras\__init__.py -> build\lib.win32-3.8\kivy\extras
creating build\lib.win32-3.8\kivy\uix
copying kivy\uix\accordion.py -> build\lib.win32-3.8\kivy\uix
copying kivy\uix\actionbar.py -> build\lib.win32-3.8\kivy\uix
copying kivy\uix\anchorlayout.py -> build\lib.win32-3.8\kivy\uix
copying kivy\tools\highlight\kivy-mode.el -> build\lib.win32-3.8\kivy\tools\highlight
copying kivy\tools\highlight\kivy.json-tmlanguage -> build\lib.win32-3.8\kivy\tools\highlight
copying kivy\tools\highlight\kivy.tmLanguage -> build\lib.win32-3.8\kivy\tools\highlight
copying kivy\tools\highlight\kivy.vim -> build\lib.win32-3.8\kivy\tools\highlight
creating build\lib.win32-3.8\kivy\tools\pep8checker
copying kivy\tools\pep8checker\pep8.py -> build\lib.win32-3.8\kivy\tools\pep8checker
copying kivy\tools\pep8checker\pep8kivy.py -> build\lib.win32-3.8\kivy\tools\pep8checker
copying kivy\tools\pep8checker\pre-commit.githook -> build\lib.win32-3.8\kivy\tools\pep8checker
creating build\lib.win32-3.8\kivy\tools\theming
creating build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\action_bar.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\action_group.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\action_group_disabled.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\action_group_down.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\action_item.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\action_item_down.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
copying kivy\tools\theming\defaulttheme\action_view.png -> build\lib.win32-
copying kivy\tools\theming\defaulttheme\vkeyboard_key_normal.png -> build\lib.win32-3.8\kivy\tools\theming\defaulttheme
running build_ext
----------------------------------------
ERROR: Command errored out with exit status 3221225477: 'C:\Users\SAGASTUME\AppData\Local\Programs\Python\Python38-32\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\SAGASTUME\\AppData\\Local\\Temp\\pip-install-8mqblxk_\\kivy\\setup.py'"'"'; __file__='"'"'C:\\Users\\SAGASTUME\\AppData\\Local\\Temp\\pip-install-8mqblxk_\\kivy\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record 'C:\Users\SAGASTUME\AppData\Local\Temp\pip-record-pvid_1bu\install-record.txt' --single-version-externally-managed --compile --install-headers 'C:\Users\SAGASTUME\AppData\Local\Programs\Python\Python38-32\Include\kivy' Check the logs for full command output.
This is part of the error code, because Stack won't let me put all the code because of the character limits, but I think this part shows the most important.

Kivy is not supported still on python 3.8, I use python 3.7, and it's the best version, because PyInstaller works on it, and you can compile for windows, mac, android and ios
So I recommend using it, delete the current version in control panel (if you're on windows) and install python 3.7.6. Remember to add to path when installing of you're on Windows!

C S, I think Kivy is not supported in Python 3.8.x.
But you can try all of these commands(If you are in windows):
pip install --upgrade pip wheel setuptools virtualenv
virtualenv kivy_venv
kivy_venv\Scripts\activate
pip install docutils pygments pypiwin32 kivy_deps.sdl2==0.1.*
kivy_deps.glew==0.1.*
pip install kivy_deps.gstreamer==0.1.*
pip install kivy_deps.angle==0.1.*
pip install kivy==1.11.1
If it still does not work downgrade to Python 3.7.x, and try all of the commands again. Even I had the same problem when I had Python 3.8, even I am a kivy programmer, So I downgraded to 3.7 and it worked for me. Try it and hope it works
Happy Python Programming!

installation of gnuhealth client $ pip3 install --user --upgrade gnuhealth-client

the error msg :
Building wheel for PyGObject (PEP 517) ... error
ERROR: Command errored out with exit status 1:
command: /usr/bin/python3 /usr/local/lib/python3.6/site-packages/pip/_vendor/pep517/_in_process.py build_wheel /tmp/tmpnfra__iq
cwd: /tmp/pip-install-4p2n3fm2/pygobject
Complete output (43 lines):
running bdist_wheel
running build
running build_py
creating build
creating build/lib.linux-x86_64-3.6
creating build/lib.linux-x86_64-3.6/pygtkcompat
copying pygtkcompat/__init__.py -> build/lib.linux-x86_64-3.6/pygtkcompat
copying pygtkcompat/generictreemodel.py -> build/lib.linux-x86_64-3.6/pygtkcompat
copying pygtkcompat/pygtkcompat.py -> build/lib.linux-x86_64-3.6/pygtkcompat
creating build/lib.linux-x86_64-3.6/gi
copying gi/__init__.py -> build/lib.linux-x86_64-3.6/gi
copying gi/_compat.py -> build/lib.linux-x86_64-3.6/gi
copying gi/_constants.py -> build/lib.linux-x86_64-3.6/gi
copying gi/_error.py -> build/lib.linux-x86_64-3.6/gi
copying gi/_gtktemplate.py -> build/lib.linux-x86_64-3.6/gi
copying gi/_option.py -> build/lib.linux-x86_64-3.6/gi
copying gi/_ossighelper.py -> build/lib.linux-x86_64-3.6/gi
copying gi/_propertyhelper.py -> build/lib.linux-x86_64-3.6/gi
copying gi/_signalhelper.py -> build/lib.linux-x86_64-3.6/gi
copying gi/docstring.py -> build/lib.linux-x86_64-3.6/gi
copying gi/importer.py -> build/lib.linux-x86_64-3.6/gi
copying gi/module.py -> build/lib.linux-x86_64-3.6/gi
copying gi/pygtkcompat.py -> build/lib.linux-x86_64-3.6/gi
copying gi/types.py -> build/lib.linux-x86_64-3.6/gi
creating build/lib.linux-x86_64-3.6/gi/repository
copying gi/repository/__init__.py -> build/lib.linux-x86_64-3.6/gi/repository
creating build/lib.linux-x86_64-3.6/gi/overrides
copying gi/overrides/GIMarshallingTests.py -> build/lib.linux-x86_64-3.6/gi/overrides
copying gi/overrides/GLib.py -> build/lib.linux-x86_64-3.6/gi/overrides
copying gi/overrides/GObject.py -> build/lib.linux-x86_64-3.6/gi/overrides
copying gi/overrides/Gdk.py -> build/lib.linux-x86_64-3.6/gi/overrides
copying gi/overrides/GdkPixbuf.py -> build/lib.linux-x86_64-3.6/gi/overrides
copying gi/overrides/Gio.py -> build/lib.linux-x86_64-3.6/gi/overrides
copying gi/overrides/Gtk.py -> build/lib.linux-x86_64-3.6/gi/overrides
copying gi/overrides/Pango.py -> build/lib.linux-x86_64-3.6/gi/overrides
copying gi/overrides/__init__.py -> build/lib.linux-x86_64-3.6/gi/overrides
copying gi/overrides/keysyms.py -> build/lib.linux-x86_64-3.6/gi/overrides
running build_ext
Package cairo-gobject was not found in the pkg-config search path.
Perhaps you should add the directory containing `cairo-gobject.pc'
to the PKG_CONFIG_PATH environment variable
No package 'cairo-gobject' found
Command '('pkg-config', '--print-errors', '--exists', 'cairo-gobject >= 0')' returned non-zero exit status 1.
----------------------------------------
ERROR: Failed building wheel for PyGObject
Failed to build PyGObject
ERROR: Could not build wheels for PyGObject which use PEP 517 and cannot be installed directly

You should install pygobject from your distribution package. Otherwise you need to install all the required headers for cairo and probably GTK.

How to fix lxml crash while pip installing

I'm moving from python3.5 to 3.6. I've created a new virtualenv and i'm attempting to install all my packages using a requirements.txt file. However, I'm running into a few problems - especially with lxml. At the moment, the one I'm stumped with is below. Esseentially the installation process stalls at the last line.
Some of the previous problems I faced (lxml wheel not building, blocks of red code) were fixed by installing python3.6-dev. But now I'm having this issue.
Requirement already satisfied: setuptools in ./.virtualenvs/legal_subs_3.6/lib/python3.6/site-packages (from protobuf==3.8.0->-r /home/amessios/.virtualenvs/legal_subs_3.6/requirements.txt (line 6)) (41.0.1)
Building wheels for collected packages: lxml
Created temporary directory: /tmp/pip-wheel-d2dc2cwm
Building wheel for lxml (setup.py) ... Destination directory: /tmp/pip-wheel-d2dc2cwm
Running command /home/amessios/.virtualenvs/legal_subs_3.6/bin/python3.6 -u -c 'import setuptools, tokenize;__file__='"'"'/tmp/pip-install-7tkf8ahf/lxml/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' bdist_wheel -d /tmp/pip-wheel-d2dc2cwm --python-tag cp36
Building lxml version 4.3.3.
Building without Cython.
Using build configuration of libxslt 1.1.28
running bdist_wheel
running build
running build_py
creating build
creating build/lib.linux-aarch64-3.6
creating build/lib.linux-aarch64-3.6/lxml
copying src/lxml/doctestcompare.py -> build/lib.linux-aarch64-3.6/lxml
copying src/lxml/pyclasslookup.py -> build/lib.linux-aarch64-3.6/lxml
copying src/lxml/cssselect.py -> build/lib.linux-aarch64-3.6/lxml
copying src/lxml/usedoctest.py -> build/lib.linux-aarch64-3.6/lxml
copying src/lxml/__init__.py -> build/lib.linux-aarch64-3.6/lxml
copying src/lxml/ElementInclude.py -> build/lib.linux-aarch64-3.6/lxml
copying src/lxml/builder.py -> build/lib.linux-aarch64-3.6/lxml
copying src/lxml/_elementpath.py -> build/lib.linux-aarch64-3.6/lxml
copying src/lxml/sax.py -> build/lib.linux-aarch64-3.6/lxml
creating build/lib.linux-aarch64-3.6/lxml/includes
copying src/lxml/includes/__init__.py -> build/lib.linux-aarch64-3.6/lxml/includes
creating build/lib.linux-aarch64-3.6/lxml/html
copying src/lxml/html/defs.py -> build/lib.linux-aarch64-3.6/lxml/html
copying src/lxml/html/formfill.py -> build/lib.linux-aarch64-3.6/lxml/html
copying src/lxml/html/_diffcommand.py -> build/lib.linux-aarch64-3.6/lxml/html
copying src/lxml/html/_html5builder.py -> build/lib.linux-aarch64-3.6/lxml/html
copying src/lxml/html/soupparser.py -> build/lib.linux-aarch64-3.6/lxml/html
copying src/lxml/html/clean.py -> build/lib.linux-aarch64-3.6/lxml/html
copying src/lxml/html/_setmixin.py -> build/lib.linux-aarch64-3.6/lxml/html
copying src/lxml/html/usedoctest.py -> build/lib.linux-aarch64-3.6/lxml/html
copying src/lxml/html/__init__.py -> build/lib.linux-aarch64-3.6/lxml/html
copying src/lxml/html/builder.py -> build/lib.linux-aarch64-3.6/lxml/html
copying src/lxml/html/html5parser.py -> build/lib.linux-aarch64-3.6/lxml/html
copying src/lxml/html/ElementSoup.py -> build/lib.linux-aarch64-3.6/lxml/html
copying src/lxml/html/diff.py -> build/lib.linux-aarch64-3.6/lxml/html
creating build/lib.linux-aarch64-3.6/lxml/isoschematron
copying src/lxml/isoschematron/__init__.py -> build/lib.linux-aarch64-3.6/lxml/isoschematron
copying src/lxml/etree.h -> build/lib.linux-aarch64-3.6/lxml
copying src/lxml/etree_api.h -> build/lib.linux-aarch64-3.6/lxml
copying src/lxml/lxml.etree.h -> build/lib.linux-aarch64-3.6/lxml
copying src/lxml/lxml.etree_api.h -> build/lib.linux-aarch64-3.6/lxml
copying src/lxml/includes/schematron.pxd -> build/lib.linux-aarch64-3.6/lxml/includes
copying src/lxml/includes/c14n.pxd -> build/lib.linux-aarch64-3.6/lxml/includes
copying src/lxml/includes/relaxng.pxd -> build/lib.linux-aarch64-3.6/lxml/includes
copying src/lxml/includes/xpath.pxd -> build/lib.linux-aarch64-3.6/lxml/includes
copying src/lxml/includes/dtdvalid.pxd -> build/lib.linux-aarch64-3.6/lxml/includes
copying src/lxml/includes/xmlparser.pxd -> build/lib.linux-aarch64-3.6/lxml/includes
copying src/lxml/includes/tree.pxd -> build/lib.linux-aarch64-3.6/lxml/includes
copying src/lxml/includes/xslt.pxd -> build/lib.linux-aarch64-3.6/lxml/includes
copying src/lxml/includes/uri.pxd -> build/lib.linux-aarch64-3.6/lxml/includes
copying src/lxml/includes/xmlschema.pxd -> build/lib.linux-aarch64-3.6/lxml/includes
copying src/lxml/includes/__init__.pxd -> build/lib.linux-aarch64-3.6/lxml/includes
copying src/lxml/includes/config.pxd -> build/lib.linux-aarch64-3.6/lxml/includes
copying src/lxml/includes/htmlparser.pxd -> build/lib.linux-aarch64-3.6/lxml/includes
copying src/lxml/includes/xmlerror.pxd -> build/lib.linux-aarch64-3.6/lxml/includes
copying src/lxml/includes/xinclude.pxd -> build/lib.linux-aarch64-3.6/lxml/includes
copying src/lxml/includes/etreepublic.pxd -> build/lib.linux-aarch64-3.6/lxml/includes
copying src/lxml/includes/lxml-version.h -> build/lib.linux-aarch64-3.6/lxml/includes
copying src/lxml/includes/etree_defs.h -> build/lib.linux-aarch64-3.6/lxml/includes
creating build/lib.linux-aarch64-3.6/lxml/isoschematron/resources
creating build/lib.linux-aarch64-3.6/lxml/isoschematron/resources/rng
copying src/lxml/isoschematron/resources/rng/iso-schematron.rng -> build/lib.linux-aarch64-3.6/lxml/isoschematron/resources/rng
creating build/lib.linux-aarch64-3.6/lxml/isoschematron/resources/xsl
copying src/lxml/isoschematron/resources/xsl/XSD2Schtrn.xsl -> build/lib.linux-aarch64-3.6/lxml/isoschematron/resources/xsl
copying src/lxml/isoschematron/resources/xsl/RNG2Schtrn.xsl -> build/lib.linux-aarch64-3.6/lxml/isoschematron/resources/xsl
creating build/lib.linux-aarch64-3.6/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_svrl_for_xslt1.xsl -> build/lib.linux-aarch64-3.6/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_schematron_message.xsl -> build/lib.linux-aarch64-3.6/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_schematron_skeleton_for_xslt1.xsl -> build/lib.linux-aarch64-3.6/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_abstract_expand.xsl -> build/lib.linux-aarch64-3.6/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_dsdl_include.xsl -> build/lib.linux-aarch64-3.6/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/readme.txt -> build/lib.linux-aarch64-3.6/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
running build_ext
building 'lxml.etree' extension
creating build/temp.linux-aarch64-3.6
creating build/temp.linux-aarch64-3.6/src
creating build/temp.linux-aarch64-3.6/src/lxml
aarch64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -DCYTHON_CLINE_IN_TRACEBACK=0 -I/usr/include/libxml2 -Isrc -Isrc/lxml/includes -I/usr/include/python3.6m -I/home/amessios/.virtualenvs/legal_subs_3.6/include/python3.6m -c src/lxml/etree.c -o build/temp.linux-aarch64-3.6/src/lxml/etree.o -w
As my packages seemed to be functioning fine in my python3.5.2 virtualenv, they should work fine on 3.6!

Nevermind! It was just taking ages to do it (without any verbose output). It finished eventually. Leaving the post up in case anyone faces the same problem and starts getting impatient.