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Python.h not found even after I used sudo install

I've been studying darkflow from the following link;
https://github.com/thtrieu/darkflow
on Ubuntu 20.04
I thought there was a problem in my flow file, so I tried to rebuild the build file by the following code
dyi#D-FIP7VAE:~/Tiny-YOLO-voc-traffic-sign-detection$ python3.7 setup.py build_ext --inplace<br/>
and this is what i got.
setup.py:6: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses
import imp
running build_ext
building 'darkflow.cython_utils.nms' extension
x86_64-linux-gnu-gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O2 -Wall -g -fdebug-prefix-map=/build/python3.7-ZE4Yn0/python3.7-3.7.10=. -fstack-protector-strong -Wformat -Werror=format-security -g -fdebug-prefix-map=/build/python3.7-ZE4Yn0/python3.7-3.7.10=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -I/home/dyi/.local/lib/python3.7/site-packages/numpy/core/include -I/usr/include/python3.7m -c darkflow/cython_utils/nms.c -o build/temp.linux-x86_64-3.7/darkflow/cython_utils/nms.o
darkflow/cython_utils/nms.c:29:10: fatal error: Python.h: No such file or directory
29 | #include "Python.h"
| ^~~~~~~~~~
compilation terminated.
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
so I tried this
sudo apt-get install python3-dev
But this didn't work, and I get the same error over and over.
Can anybody find the reason why..?

You can try :
sudo apt install libpython3.7-dev

OSx Mavericks Python-LDAP pip install failing [duplicate]

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.
Closed 11 years ago.
So I got the latest python-ldap from source. I am also running the source compiled version of python 2.7.2 and I am running this on RHEL. So when I try to compile the package I get this long error message as seen below. So I installed the openldap-devel package and now it is a much smaller error. But still not compiling.
extra_compile_args: -g
extra_objects:
include_dirs: /opt/openldap-RE24/include /usr/include/sasl
library_dirs: /opt/openldap-RE24/lib
libs: ldap_r lber sasl2 ssl crypto
running install
running bdist_egg
running egg_info
writing requirements to Lib/python_ldap.egg-info/requires.txt
writing Lib/python_ldap.egg-info/PKG-INFO
writing top-level names to Lib/python_ldap.egg-info/top_level.txt
writing dependency_links to Lib/python_ldap.egg-info/dependency_links.txt
file Lib/ldap.py (for module ldap) not found
file Lib/ldap/controls.py (for module ldap.controls) not found
file Lib/ldap/extop.py (for module ldap.extop) not found
file Lib/ldap/schema.py (for module ldap.schema) not found
reading manifest file 'Lib/python_ldap.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no files found matching 'Makefile'
warning: no files found matching 'Modules/LICENSE'
writing manifest file 'Lib/python_ldap.egg-info/SOURCES.txt'
installing library code to build/bdist.linux-x86_64/egg
running install_lib
running build_py
file Lib/ldap.py (for module ldap) not found
file Lib/ldap/controls.py (for module ldap.controls) not found
file Lib/ldap/extop.py (for module ldap.extop) not found
file Lib/ldap/schema.py (for module ldap.schema) not found
file Lib/ldap.py (for module ldap) not found
file Lib/ldap/controls.py (for module ldap.controls) not found
file Lib/ldap/extop.py (for module ldap.extop) not found
file Lib/ldap/schema.py (for module ldap.schema) not found
running build_ext
building '_ldap' extension
gcc -pthread -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -DHAVE_LIBLDAP_R -DHAVE_SASL -DHAVE_TLS -DLDAPMODULE_VERSION=2.4.1 -IModules -I/opt/openldap-RE24/include -I/usr/include/sasl -I/opt/home/mradmin/.local/include/python2.7 -c Modules/LDAPObject.c -o build/temp.linux-x86_64-2.7/Modules/LDAPObject.o -g
In file included from Modules/LDAPObject.c:18:
/usr/include/sasl/sasl.h:349: warning: function declaration isnât a prototype
gcc -pthread -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -DHAVE_LIBLDAP_R -DHAVE_SASL -DHAVE_TLS -DLDAPMODULE_VERSION=2.4.1 -IModules -I/opt/openldap-RE24/include -I/usr/include/sasl -I/opt/home/mradmin/.local/include/python2.7 -c Modules/ldapcontrol.c -o build/temp.linux-x86_64-2.7/Modules/ldapcontrol.o -g
Modules/ldapcontrol.c: In function âencode_assertion_controlâ:
Modules/ldapcontrol.c:350: warning: implicit declaration of function âldap_create_assertion_control_valueâ
gcc -pthread -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -DHAVE_LIBLDAP_R -DHAVE_SASL -DHAVE_TLS -DLDAPMODULE_VERSION=2.4.1 -IModules -I/opt/openldap-RE24/include -I/usr/include/sasl -I/opt/home/mradmin/.local/include/python2.7 -c Modules/common.c -o build/temp.linux-x86_64-2.7/Modules/common.o -g
gcc -pthread -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -DHAVE_LIBLDAP_R -DHAVE_SASL -DHAVE_TLS -DLDAPMODULE_VERSION=2.4.1 -IModules -I/opt/openldap-RE24/include -I/usr/include/sasl -I/opt/home/mradmin/.local/include/python2.7 -c Modules/constants.c -o build/temp.linux-x86_64-2.7/Modules/constants.o -g
Modules/constants.c: In function âLDAPinit_constantsâ:
Modules/constants.c:153: error: âLDAP_OPT_DIAGNOSTIC_MESSAGEâ undeclared (first use in this function)
Modules/constants.c:153: error: (Each undeclared identifier is reported only once
Modules/constants.c:153: error: for each function it appears in.)
Modules/constants.c:363: error: âLDAP_CONTROL_RELAXâ undeclared (first use in this function)
error: command 'gcc' failed with exit status 1
Since this is closed because the question, this doesnt ocmpile please help me out is not a question. I figured it out. I had to manually compile the latest ldap, berkleydb, and then do a build install with it. Then it built fine

The first and second error message state that you're missing lber.h and ldap.h. This is a strong pointer to a missing or invalid openldap-devel package. Do you you have that package (or a similar one matching *ldap-dev*) installed?

Possibly a mismatch in the OpenLDAP and python-ldap versions. Try to compile the latest python-ldap version against a decent version of OpenSSL. E.g. Debian systems have notorious old versions of OpenLDAP installed...

Installing Matplotlib on CentOS 6.5

I'm trying to get matplotlib-1.4.0 installed on CentOS 6.5 with Python 2.7.8. I've tried installing with pip and from source. I initially got an error message stating I needed a newer version of Freetype2, which I then installed (version 2.5.3) to /usr/local/bin, /usr/local/include, and /usr/local/lib. The older version of Freetype2 (2.3.11) is in /usr/bin, /usr/include/freetype2/freetype, and /usr/lib.
Now when I try installing matplotlib (python setup.py build) it looks like the include paths are all pointing to the wrong (old) version of Freetype2, and I can't figure out how to change the appropriate paths to point to the newer version of Freetype2. The actual error message is below, and is pretty messy. I couldn't find much about his error online, but I can see that the wrong Freetype2 path so I'm guessing that's what causing the issue. Any tips?
Found tips on other threads about adding /usr/include/freetype symlink to point to /usr/local/include/freetype2, but that didn't help.
building 'matplotlib.ft2font' extension
gcc -pthread -fno-strict-aliasing -O3 -m64 -mfpmath=sse -msse2 -mtune=generic -DNDEBUG -g -fwrapv -O3 -Wall -fPIC -DPY_ARRAY_UNIQUE_SYMBOL=MPL_matplotlib_ft2font_ARRAY_API -DPYCXX_ISO_CPP_LIB=1 -I/usr/local/python2/2.7.8/x86_64/gcc46/nonet/lib/python2.7/site-packages/numpy/core/include -I/usr/include/freetype2 -I/usr/local/include -I/usr/include -I. -Iextern -I/usr/local/python2/2.7.8/x86_64/gcc46/nonet/include/python2.7 -c src/ft2font.cpp -o build/temp.linux-x86_64-2.7/src/ft2font.o
In file included from /usr/local/python2/2.7.8/x86_64/gcc46/nonet/lib/python2.7/site-packages/numpy/core/include/numpy/ndarraytypes.h:1761:0,
from /usr/local/python2/2.7.8/x86_64/gcc46/nonet/lib/python2.7/site-packages/numpy/core/include/numpy/ndarrayobject.h:17,
from src/file_compat.h:7,
from src/ft2font.cpp:7:
/usr/local/python2/2.7.8/x86_64/gcc46/nonet/lib/python2.7/site-packages/numpy/core/include/numpy/npy_1_7_deprecated_api.h:15:2: warning: #warning "Using deprecated NumPy API, disable it by " "#defining NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION" [-Wcpp]
In file included from src/ft2font.cpp:7:0:
src/file_compat.h:31:0: warning: "npy_fseek" redefined [enabled by default]
/usr/local/python2/2.7.8/x86_64/gcc46/nonet/lib/python2.7/site-packages/numpy/core/include/numpy/npy_common.h:86:0: note: this is the location of the previous definition
src/file_compat.h:32:0: warning: "npy_ftell" redefined [enabled by default]
/usr/local/python2/2.7.8/x86_64/gcc46/nonet/lib/python2.7/site-packages/numpy/core/include/numpy/npy_common.h:91:0: note: this is the location of the previous definition
src/ft2font.cpp: In member function ‘Py::Object FT2Image::py_write_bitmap(const Py::Tuple&)’:
src/ft2font.cpp:184:15: warning: unused variable ‘offset’ [-Wunused-variable]
gcc -pthread -fno-strict-aliasing -O3 -m64 -mfpmath=sse -msse2 -mtune=generic -DNDEBUG -g -fwrapv -O3 -Wall -fPIC -DPY_ARRAY_UNIQUE_SYMBOL=MPL_matplotlib_ft2font_ARRAY_API -DPYCXX_ISO_CPP_LIB=1 -I/usr/local/python2/2.7.8/x86_64/gcc46/nonet/lib/python2.7/site-packages/numpy/core/include -I/usr/include/freetype2 -I/usr/local/include -I/usr/include -I. -Iextern -I/usr/local/python2/2.7.8/x86_64/gcc46/nonet/include/python2.7 -c src/mplutils.cpp -o build/temp.linux-x86_64-2.7/src/mplutils.o
In file included from /usr/local/python2/2.7.8/x86_64/gcc46/nonet/include/python2.7/Python.h:8:0,
from src/mplutils.h:18,
from src/mplutils.cpp:6:
/usr/local/python2/2.7.8/x86_64/gcc46/nonet/include/python2.7/pyconfig.h:1182:0: warning: "_POSIX_C_SOURCE" redefined [enabled by default]
/usr/include/features.h:162:0: note: this is the location of the previous definition
/usr/local/python2/2.7.8/x86_64/gcc46/nonet/include/python2.7/pyconfig.h:1204:0: warning: "_XOPEN_SOURCE" redefined [enabled by default]
/usr/include/features.h:164:0: note: this is the location of the previous definition
gcc -pthread -fno-strict-aliasing -O3 -m64 -mfpmath=sse -msse2 -mtune=generic -DNDEBUG -g -fwrapv -O3 -Wall -fPIC -DPY_ARRAY_UNIQUE_SYMBOL=MPL_matplotlib_ft2font_ARRAY_API -DPYCXX_ISO_CPP_LIB=1 -I/usr/local/python2/2.7.8/x86_64/gcc46/nonet/lib/python2.7/site-packages/numpy/core/include -I/usr/include/freetype2 -I/usr/local/include -I/usr/include -I. -Iextern -I/usr/local/python2/2.7.8/x86_64/gcc46/nonet/include/python2.7 -c extern/CXX/cxxsupport.cxx -o build/temp.linux-x86_64-2.7/extern/CXX/cxxsupport.o
gcc -pthread -fno-strict-aliasing -O3 -m64 -mfpmath=sse -msse2 -mtune=generic -DNDEBUG -g -fwrapv -O3 -Wall -fPIC -DPY_ARRAY_UNIQUE_SYMBOL=MPL_matplotlib_ft2font_ARRAY_API -DPYCXX_ISO_CPP_LIB=1 -I/usr/local/python2/2.7.8/x86_64/gcc46/nonet/lib/python2.7/site-packages/numpy/core/include -I/usr/include/freetype2 -I/usr/local/include -I/usr/include -I. -Iextern -I/usr/local/python2/2.7.8/x86_64/gcc46/nonet/include/python2.7 -c extern/CXX/cxx_extensions.cxx -o build/temp.linux-x86_64-2.7/extern/CXX/cxx_extensions.o
gcc -pthread -fno-strict-aliasing -O3 -m64 -mfpmath=sse -msse2 -mtune=generic -DNDEBUG -g -fwrapv -O3 -Wall -fPIC -DPY_ARRAY_UNIQUE_SYMBOL=MPL_matplotlib_ft2font_ARRAY_API -DPYCXX_ISO_CPP_LIB=1 -I/usr/local/python2/2.7.8/x86_64/gcc46/nonet/lib/python2.7/site-packages/numpy/core/include -I/usr/include/freetype2 -I/usr/local/include -I/usr/include -I. -Iextern -I/usr/local/python2/2.7.8/x86_64/gcc46/nonet/include/python2.7 -c extern/CXX/IndirectPythonInterface.cxx -o build/temp.linux-x86_64-2.7/extern/CXX/IndirectPythonInterface.o
gcc -pthread -fno-strict-aliasing -O3 -m64 -mfpmath=sse -msse2 -mtune=generic -DNDEBUG -g -fwrapv -O3 -Wall -fPIC -DPY_ARRAY_UNIQUE_SYMBOL=MPL_matplotlib_ft2font_ARRAY_API -DPYCXX_ISO_CPP_LIB=1 -I/usr/local/python2/2.7.8/x86_64/gcc46/nonet/lib/python2.7/site-packages/numpy/core/include -I/usr/include/freetype2 -I/usr/local/include -I/usr/include -I. -Iextern -I/usr/local/python2/2.7.8/x86_64/gcc46/nonet/include/python2.7 -c extern/CXX/cxxextensions.c -o build/temp.linux-x86_64-2.7/extern/CXX/cxxextensions.o
g++ -pthread -shared build/temp.linux-x86_64-2.7/src/ft2font.o build/temp.linux-x86_64-2.7/src/mplutils.o build/temp.linux-x86_64-2.7/extern/CXX/cxxsupport.o build/temp.linux-x86_64-2.7/extern/CXX/cxx_extensions.o build/temp.linux-x86_64-2.7/extern/CXX/IndirectPythonInterface.o build/temp.linux-x86_64-2.7/extern/CXX/cxxextensions.o -L/usr/local/lib -L/usr/local/lib64 -L/usr/lib -L/usr/lib64 -L/usr/local/python2/2.7.8/x86_64/gcc46/nonet/lib -lfreetype -lstdc++ -lm -lpython2.7 -o build/lib.linux-x86_64-2.7/matplotlib/ft2font.so
/usr/bin/ld: /usr/local/lib/libpython2.7.a(abstract.o): relocation R_X86_64_32S against `_Py_NotImplementedStruct' can not be used when making a shared object; recompile with -fPIC
/usr/local/lib/libpython2.7.a: could not read symbols: Bad value
collect2: ld returned 1 exit status
error: command 'g++' failed with exit status 1

Although I'm using python-2.6 I just bodged a way through the exact same freetype error: essentially you can simply download the matplotlib python archive and edit the requirement for freetype-2.4 to freetype-2.3. This was all done in a virtualenv naturally.
get a copy of the current latest matplotlib
pip install --download . matplotlib==1.4.0
untar the result
tar -xzvf matplotlib-1.4.0.tar.gz
edit the explicit requirement for freetype from 2.4 to 2.3 (line 945)
vi matplotlib-1.4.0/setupext.py
min_version='2.4', version=version)
recreate the archive
tar -czvf matplotlib-1.4.0.tar.gz
install the requirements
pip install numpy
pip install geojson==1.0.6
Install your modified local archive, and watch as it compiles
pip install --verbose matplotlib-1.4.0.tar.gz

I finally had time to return to this and it had nothing to do with Freetype. The issue was the wrong version of libpython2.7 being picked up during the build. Specifically in this line:
g++ -pthread -shared build/temp.linux-x86_64-2.7/src/ft2font.o build/temp.linux-x86_64-2.7/src/mplutils.o build/temp.linux-x86_64-2.7/extern/CXX/cxxsupport.o build/temp.linux-x86_64-2.7/extern/CXX/cxx_extensions.o build/temp.linux-x86_64-2.7/extern/CXX/IndirectPythonInterface.o build/temp.linux-x86_64-2.7/extern/CXX/cxxextensions.o -L/usr/local/lib -L/usr/local/lib64 -L/usr/lib -L/usr/lib64 -L/usr/local/python2/2.7.8/x86_64/gcc46/nonet/lib -lfreetype -lstdc++ -lm -lpython2.7 -o build/lib.linux-x86_64-2.7/matplotlib/ft2font.so
The first -L directory is /usr/local/lib which contained a different version of the python library (libpython2.7.a) than the one I should have been compiling against. I moved this file temporarily and the build was then successful (it found the correct version in /usr/local/python2/2.7.8/x86_64/gcc46/nonet/lib).
I'm not exactly sure where the python lib in /usr/local/lib originated from. If it's the system version then this could be considered a bug in the matplotlib build script.

I also have this problem when compiling the matplotlib-1.4.3 from source code. After this error, I simply export LDFLAGS="/home/ubuntu/softwares/python-2.7.11/lib", then python setup.py install. The error is gone and I can install the matplotlib successfully.

In case you want to install the most recent version of matplotlib compatible with Python 2.6 on CentOS 6 (currently 6.9 when I wrote this), here's how I did.
Logged as root, type:
sudo yum install -y epel-release
sudo yum install -y python-pip
sudo yum install -y gcc gcc-c++ python-argparse python-devel freetype-devel libpng-devel
pip install --upgrade pip
pip install numpy==1.11.3 # latest version working with Python 2.6
pip install --upgrade distribute # required by matplotlib 1.4
pip install -I setuptools # "distribute" installation will remove setuptools, so we need to reinstall it
pip install matplotlib==1.4.3 # latest version working with Python 2.6

Install Twisted in python failed with 'No such file'

I want use Twisted in Python, but when I installing ,in comes this error, how to handle it?
....
running build_ext
gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/python2.7 -c conftest.c -o conftest.o
gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/python2.7 -c conftest.c -o conftest.o
building 'twisted.runner.portmap' extension
gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/python2.7 -c twisted/runner/portmap.c -o build/temp.linux-i686-2.7/twisted/runner/portmap.o
twisted/runner/portmap.c:10:20: fatal error: Python.h: No such file or directory
compilation terminated.
error: command 'gcc' failed with exit status 1

You are missing the python development headers, needed to build packages that need to compile extensions.
If you are building on OSX, make sure you either install a prebuilt mac python package or if building python from source, use the framework flag when configuring. And also make sure you have XCODE installed so that you have a compiler.
If you are building on Linux, you probably need to install the python devel headers. For instance on Ubuntu you would need: apt-get install build-essential python-dev.
Once you have the python development headers, twisted should be able to find them when you build with that python interpreter.

GDAL install on Mac OS X Lion

I'm trying to install GDAL 1.7.1 on Mac OS X Lion using:
python setup.py build
python setup.py install
and get the error:
running build
running build_py
running build_ext
building 'osgeo._gdal' extension
llvm-gcc-4.2 -fno-strict-aliasing -fno-common -dynamic -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -mno-fused-madd -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -pipe -arch i386 -arch x86_64 -I../../port -I../../gcore -I../../alg -I../../ogr/ -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -I/Library/Python/2.7/site-packages/numpy-2.0.0.dev_e2af7b7_20110721-py2.7-macosx-10.7-x86_64.egg/numpy/core/include -I/Library/Frameworks/GDAL.framework/Versions/1.7/include -c extensions/gdal_wrap.cpp -o build/temp.macosx-10.7-intel-2.7/extensions/gdal_wrap.o
unable to execute llvm-gcc-4.2: No such file or directory
error: command 'llvm-gcc-4.2' failed with exit status 1
Is this the right compiler? How can I get this working?
UPDATE:
I get a little further with Xcode installed:
running build
running build_py
running build_ext
building 'osgeo._gdal' extension
llvm-gcc-4.2 -fno-strict-aliasing -fno-common -dynamic -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -mno-fused-madd -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch i386 -arch x86_64 -pipe -I../../port -I../../gcore -I../../alg -I../../ogr/ -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -I/Library/Python/2.7/site-packages/numpy-2.0.0.dev_e2af7b7_20110721-py2.7-macosx-10.7-x86_64.egg/numpy/core/include -I/Library/Frameworks/GDAL.framework/Versions/1.7/include -c extensions/gdal_wrap.cpp -o build/temp.macosx-10.7-intel-2.7/extensions/gdal_wrap.o
cc1plus: warning: command line option "-Wstrict-prototypes" is valid for Ada/C/ObjC but not for C++
extensions/gdal_wrap.cpp:2813:22: error: cpl_port.h: No such file or directory
extensions/gdal_wrap.cpp:2814:24: error: cpl_string.h: No such file or directory
extensions/gdal_wrap.cpp:2815:27: error: cpl_multiproc.h: No such file or directory
extensions/gdal_wrap.cpp:2817:18: error: gdal.h: No such file or directory
extensions/gdal_wrap.cpp:2818:23: error: gdal_priv.h: No such file or directory
extensions/gdal_wrap.cpp:2819:22: error: gdal_alg.h: No such file or directory
extensions/gdal_wrap.cpp:2820:24: error: gdalwarper.h: No such file or directory
extensions/gdal_wrap.cpp:2837: error: expected initializer before ‘VeryQuietErrorHandler’
extensions/gdal_wrap.cpp:2713: warning: ‘swig_module’ defined but not used
cc1plus: warning: command line option "-Wstrict-prototypes" is valid for Ada/C/ObjC but not for C++
extensions/gdal_wrap.cpp:2813:22: error: cpl_port.h: No such file or directory
extensions/gdal_wrap.cpp:2814:24: error: cpl_string.h: No such file or directory
extensions/gdal_wrap.cpp:2815:27: error: cpl_multiproc.h: No such file or directory
extensions/gdal_wrap.cpp:2817:18: error: gdal.h: No such file or directory
extensions/gdal_wrap.cpp:2818:23: error: gdal_priv.h: No such file or directory
extensions/gdal_wrap.cpp:2819:22: error: gdal_alg.h: No such file or directory
extensions/gdal_wrap.cpp:2820:24: error: gdalwarper.h: No such file or directory
extensions/gdal_wrap.cpp:2837: error: expected initializer before ‘VeryQuietErrorHandler’
extensions/gdal_wrap.cpp:2713: warning: ‘swig_module’ defined but not used
lipo: can't open input file: /var/tmp//ccgnLEPX.out (No such file or directory)
error: command 'llvm-gcc-4.2' failed with exit status 1

Homebrew works great for me. To install GDAL 1.9 with Homebrew all you have to do is
brew install gdal
Homebrew requires xcode, and I think commandline tools. More information can be found here

How about using the precompiled binaries available from http://www.kyngchaos.com/software/frameworks
Also, are you using 1.7.1 for a specific reason? 1.8.1 is, I believe, the current release build.
Caveat: I do not know if Lion is yet supported by the GDAL OSX binaries.

Did you actually install Xcode 4.1 on 10.7? Downloading it from the App Store is not enough; you have to manually run the Installer which it downloads to /Applications.

If you actually want to build from source, but want a convenient way to install there is a gdal package available from MacPorts - just install MacPorts, then on the command line type:
port install gdal
Macports will fetch and compile the source code for you. As of the time of writing the version in MacPorts is 1.9.0

for installing GDAL on mac:
brew install gdal
and then
pip install gdal
solved this for me