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How to install PyGreSQL using Virtualenv on Mac OS Sierra

I'm configuring a virtualenv to work with a legacy webservices application developed on python using flask microframework and PostgreSQLdatabase, this application use PyGreSQL 5.0.3 as a dependency to connect with the database.
I have installed the PostgreSQL 9.6.1, i installed it using:
brew install postgresql
I have installed and working with Python 2.7
When i run the
pip install -r requirements.txt
i'm gettin this error message:
Running setup.py install for PyGreSQL ... error
Complete output from command /Users/user/Development/Projects/flask/ws/myenv/bin/python -u -c "import setuptools, tokenize;__file__='/private/var/folders/t1/x7lrbmyd3lq0k8ngknwg1zx00000gn/T/pip-build-KjQgiU/PyGreSQL/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /var/folders/t1/x7lrbmyd3lq0k8ngknwg1zx00000gn/T/pip-3lBp1N-record/install-record.txt --single-version-externally-managed --compile --install-headers /Users/user/Development/Projects/flask/ws/myenv/include/site/python2.7/PyGreSQL:
running install
running build
running build_py
creating build
creating build/lib.macosx-10.12-intel-2.7
copying pg.py -> build/lib.macosx-10.12-intel-2.7
copying pgdb.py -> build/lib.macosx-10.12-intel-2.7
running build_ext
building '_pg' extension
creating build/temp.macosx-10.12-intel-2.7
cc -fno-strict-aliasing -fno-common -dynamic -arch x86_64 -arch i386 -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch x86_64 -arch i386 -pipe -DPYGRESQL_VERSION=5.0.3 -DDIRECT_ACCESS -DLARGE_OBJECTS -DDEFAULT_VARS -DESCAPING_FUNCS -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -I/usr/local/Cellar/postgresql/9.6.1/include -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c pgmodule.c -o build/temp.macosx-10.12-intel-2.7/pgmodule.o -O2 -funsigned-char -Wall -Werror
pgmodule.c:4143:9: error: implicit conversion loses integer precision: 'long' to 'int' [-Werror,-Wshorten-64-to-32]
num = PyInt_AsLong(param);
~ ^~~~~~~~~~~~~~~~~~~
pgmodule.c:4448:12: error: implicit conversion loses integer precision: 'long' to 'int' [-Werror,-Wshorten-64-to-32]
pgport = PyInt_AsLong(pg_default_port);
~ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2 errors generated.
error: command 'cc' failed with exit status 1
----------------------------------------
As you can see, this error is derived from compile and build the package, but I have the postgresql library installed, which I see as the common problem in other cases. On the other hand I have installed the command line tools of mac, i changed my compiler from cc to gcc and i'm having the same error
Any idea how to solve it, thank you in advance

I wasn't able to install any version of this package normally. It's probably a problem with the package.
Workaround: If you turn off warn-as-error, it should compile fine.
export CFLAGS="-Wno-error"
pip install PyGreSQL

Error compiling pyGraphviz on Os X 10.9

Good day to everyone,
I've an error trying to compile and install Pygraphviz 1.2 in OS X 10.9
I've downloaded the pygraphviz archive from https://pypi.python.org/packages/source/p/pygraphviz/pygraphviz-1.2.zip#md5=90c728a8db276eede4e3af2f990a8985
From Terminal I've typed
sudo ./setup.py install
the output was:
Trying pkg-config
library_path=/usr/local/Cellar/graphviz/2.38.0/lib
include_path=/usr/local/Cellar/graphviz/2.38.0/include/graphviz
running install
running build
running build_py
running build_ext
building 'pygraphviz._graphviz' extension
cc -fno-strict-aliasing -fno-common -dynamic -arch x86_64 -arch i386 -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 x86_64 -arch i386 -pipe -I/usr/local/Cellar/graphviz/2.38.0/include/graphviz -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c pygraphviz/graphviz_wrap.c -o build/temp.macosx-10.9-intel-2.7/pygraphviz/graphviz_wrap.o
clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
error: command 'cc' failed with exit status 1
As you can see I've already installed graphviz with Homebrew.

The error is in clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
Solution from clang error: unknown argument: '-mno-fused-madd' (python package installation failure) is:
export CFLAGS=-Qunused-arguments
export CPPFLAGS=-Qunused-arguments

Errors while installing matplotlib on OS X 10.8

I am trying to install matplotlib on my machine with OS X 10.8 and XCode 5.0.2. I get these weird errors of which I am not able to make sense. I used pip install matplotlib to install the package, but then it returns the following errors at the end. I am clueless on what to do. Please help me proceed. I tried to install scipy through the same process and the same error stream prevails.
building 'rootfind' library
compiling C sources
C compiler: clang -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 -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch i386 -arch x86_64 -pipe
creating build/temp.macosx-10.8-intel-2.7/scipy/optimize/Zeros
compile options: '-I/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/numpy/core/include -c'
clang: scipy/optimize/Zeros/bisect.c
clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
error: Command "clang -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 -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch i386 -arch x86_64 -pipe -I/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/numpy/core/include -c scipy/optimize/Zeros/bisect.c -o build/temp.macosx-10.8-intel-2.7/scipy/optimize/Zeros/bisect.o" failed with exit status 1
----------------------------------------
Cleaning up...
Command /usr/bin/python -c "import setuptools, tokenize;__file__='/private/var/folders/v3/xf03tznj5hn9mj7j_4jbkvw40000gn/T/pip_build_Siva/scipy/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/v3/xf03tznj5hn9mj7j_4jbkvw40000gn/T/pip-u0HK_Y-record/install-record.txt --single-version-externally-managed --compile failed with error code 1 in /private/var/folders/v3/xf03tznj5hn9mj7j_4jbkvw40000gn/T/pip_build_Siva/scipy
After this I set the ARCHFLAGS variable to the following
export ARCHFLAGS='-Wno-error=unused-command-line-argument-hard-error-in-future'
Although the installatoion proceeds a bit further, I get an error stream at a different point now.
running build_ext
building 'matplotlib.ft2font' extension
creating build/temp.macosx-10.8-intel-2.7
creating build/temp.macosx-10.8-intel-2.7/src
creating build/temp.macosx-10.8-intel-2.7/CXX
clang -fno-strict-aliasing -fno-common -dynamic -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -mno-fused-madd -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wshorten-64-to-32 -DNDEBUG -g -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch i386 -arch x86_64 -pipe -DPY_ARRAY_UNIQUE_SYMBOL=MPL_matplotlib_ft2font_ARRAY_API -DPYCXX_ISO_CPP_LIB=1 -I/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/numpy/core/include -I/usr/local/include -I/usr/include -I. -I/usr/local/Cellar/freetype/2.5.3_1/include/freetype2 -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c src/ft2font.cpp -o build/temp.macosx-10.8-intel-2.7/src/ft2font.o
clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
error: command 'clang' failed with exit status 1
----------------------------------------
Cleaning up...
Command /usr/bin/python -c "import setuptools, tokenize;__file__='/private/tmp/pip_build_root/matplotlib/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-ZU81yE-record/install-record.txt --single-version-externally-managed --compile failed with error code 1 in /private/tmp/pip_build_root/matplotlib

That's a common problem, the last macos updates make clang generate errors instead of warnings for unknown compiler options. As a temporary workaround you could set ARCHFLAGS environment variable, before running pip:
export ARCHFLAGS='-Wno-error=unused-command-line-argument-hard-error-in-future'

I prefer to use Canopy as a python environment on OS X since it is usually harder to install python packages on a Mac.
You can get it here : https://www.enthought.com/downloads/.
MatPlotLib is installed by default, and many more packages are easier to install after installing Canopy.

Problems of installing scikit-learn in Python

I was trying to install python package scikit-­learn. I keep get an error.
I tried
pip install scikit­-learn
The error looks like following. What is the problem of my installation?
compile options: '-I/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/numpy/core/include -c'
c++: sklearn/svm/src/libsvm/libsvm_template.cpp
clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
error: Command "c++ -fno-strict-aliasing -fno-common -dynamic -arch x86_64 -arch i386 -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -mno-fused-madd -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wshorten-64-to-32 -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch x86_64 -arch i386 -pipe -I/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/numpy/core/include -c sklearn/svm/src/libsvm/libsvm_template.cpp -o build/temp.macosx-10.9-intel-2.7/sklearn/svm/src/libsvm/libsvm_template.o" failed with exit status 1
----------------------------------------
Cleaning up...
Command /usr/bin/python -c "import setuptools, tokenize;__file__='/private/tmp/pip_build_root/scikit-learn/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-GYuqQN-record/install-record.txt --single-version-externally-managed --compile failed with error code 1 in /private/tmp/pip_build_root/scikit-learn
Storing debug log for failure in /Users/johnkuk/Library/Logs/pip.log
I also tried several different ways to install the package. From easy_install, I also got following error message.
clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
error: Setup script exited with error: Command "c++ -fno-strict-aliasing -fno-common -dynamic -arch x86_64 -arch i386 -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -mno-fused-madd -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wshorten-64-to-32 -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch x86_64 -arch i386 -pipe -I/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/numpy/core/include -c /private/tmp/easy_install-oD3dwa/scikit-learn-0.14.1/sklearn/svm/src/libsvm/libsvm_template.cpp -o build/temp.macosx-10.9-intel-2.7/private/tmp/easy_install-oD3dwa/scikit-learn-0.14.1/sklearn/svm/src/libsvm/libsvm_template.o" failed with exit status 1
/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/numpy/distutils/misc_util.py:252: RuntimeWarning: Parent module 'numpy.distutils' not found while handling absolute import
from numpy.distutils import log

I had the same trouble today, after trying many things the one that worked me was setting some environment variables before installing with pip resolved the issue for me:
export CFLAGS=-Qunused-arguments
export CPPFLAGS=-Qunused-arguments
And then install with sudo:
sudo -E pip install -U scikit-learn
it's seems to be a problem with xcode update (5.1.1 for me), it does not accept '-mno-fused-madd' as an argument, before it threw it a warning, know is an error, the first two commands ignore the unused arguments witch are the same that throw the error.
Hope it helps, any comments/corrections are welcome.

Installing Python libraries using Pip

thanks in advance for any help!
I'm trying to install a set of Python 2.7.5 libraries using Pip 1.5.2. I'm following the directions to install NuPIC on my mac (OS X Mavericks).
Everything was going fine until I ran this line:
sudo pip install --allow-all-external --allow-unverified PIL --allow-unverified psutil -r $NUPIC/external/common/requirements.txt
I got this error:
building '_imagingft' extension
cc -fno-strict-aliasing -fno-common -dynamic -arch x86_64 -arch i386 -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -mno-fused-madd -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch x86_64 -arch i386 -pipe -I/System/Library/Frameworks/Tcl.framework/Headers -I/System/Library/Frameworks/Tk.framework/Headers -I/usr/local/include/freetype2 -IlibImaging -I/System/Library/Frameworks/Python.framework/Versions/2.7/include -I/usr/local/include -I/usr/include -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c _imagingft.c -o build/temp.macosx-10.9-intel-2.7/_imagingft.o
clang: warning: argument unused during compilation: '-mno-fused-madd'
_imagingft.c:73:10: fatal error: 'freetype/fterrors.h' file not found
#include <freetype/fterrors.h>
^
1 error generated.
error: command 'cc' failed with exit status 1
----------------------------------------
Cleaning up...
Command /usr/bin/python -c "import setuptools, tokenize;__file__='/private/tmp/pip_build_root/PIL/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-vJHHeE-record/install-record.txt --single-version-externally-managed --compile failed with error code 1 in /private/tmp/pip_build_root/PIL
Storing debug log for failure in /Users/aaronclaytondunn/Library/Logs/pip.log
And here's the requirements file ($NUPIC/external/common/requirements.txt):
#See http://www.pip-installer.org/en/latest/requirements.html for details
asteval==0.9.1
mock==1.0.1
ordereddict==1.1
PIL==1.1.7
psutil==1.0.1
pylint==0.28.0
pytest==2.4.2
pytest-cov==1.6
pytest-xdist==1.8
python-dateutil==2.1
PyYAML==3.10
unittest2==0.5.1
validictory==0.9.1
PyMySQL==0.5
DBUtils==1.1
numpy==1.7.1
tweepy==2.1
It was chugging along well for a while, so I assume it successfully installed some of the libraries and broke on one. Any ideas what's going wrong?

The "Linked" question here Error installing Python Image Library using pip on Mac OS X 10.9 answers this issue (the top up-voted answer). Basically PIL doesn't install freetype headers properly any more. You need to link the new location to /usr/include/freetype.

fterrors.h
file was missed in your path. You can explicitely download and place this file in the appropriate directory.

You might need to install freetype.
brew install freetype