Python – Pycrypto install fatal error: gmp.h file not found

It seems like there are a number of people who have had a similar problem, however, after much searching I haven't been able to find a solution that works with my particular architecture. I'm trying to install Pycrypto (as a subsidiary of Fabric) to no avail.

I'm running Mac 10.8.2, python 2.7.3 via Homebrew, and XCode 4.6 — installing with pip or easy_install (I've tried both). From what I can tell, the problem could either be with respect to my version of XCode or because of my libraries. The Command Line Tools for XCode have been installed and I have tried placing setenv ARCHFLAGS "-arch i386 -arch x86_64" in my .cshrc file. I have also tried ln -s /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer /Developer. As for the libraries, I've tried linking them via ln -s /usr/local/lib/libgmp.dylib /usr/lib/libgmp.dylib – but that also didn't work.

The error is always the same (see below) no matter what angle I attempt. Any and all help would be appreciated.

/usr/local/share/python% pip install pycrypto
Downloading/unpacking pycrypto
  Running setup.py egg_info for package pycrypto

Installing collected packages: pycrypto
  Running setup.py install for pycrypto
    building 'Crypto.PublicKey._fastmath' extension
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -fno-strict-aliasing -fno-common -dynamic -arch i386 -arch x86_64 -pipe -mmacosx-version-min=10.8 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk -Wno-unused-value -Wno-empty-body -Qunused-arguments -fwrapv -Wall -Wstrict-prototypes -std=c99 -O3 -fomit-frame-pointer -Isrc/ -I/usr/include/ -I/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c src/_fastmath.c -o build/temp.macosx-10.8-intel-2.7/src/_fastmath.o
src/_fastmath.c:36:11: fatal error: 'gmp.h' file not found
# include <gmp.h>
          ^
1 error generated.
error: command '/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang' failed with exit status 1
Complete output from command /usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python -c "import setuptools;__file__='/var/folders/ym/v8l23q_x2xz_qhx3m84n6ym00005fr/T/pip-build/pycrypto/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/ym/v8l23q_x2xz_qhx3m84n6ym00005fr/T/pip-Xb7nGV-record/install-record.txt --single-version-externally-managed:
running install

running build

running build_py

running build_ext

running build_configure

building 'Crypto.PublicKey._fastmath' extension

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -fno-strict-aliasing -fno-common -dynamic -arch i386 -arch x86_64 -pipe -mmacosx-version-min=10.8 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk -Wno-unused-value -Wno-empty-body -Qunused-arguments -fwrapv -Wall -Wstrict-prototypes -std=c99 -O3 -fomit-frame-pointer -Isrc/ -I/usr/include/ -I/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c src/_fastmath.c -o build/temp.macosx-10.8-intel-2.7/src/_fastmath.o

src/_fastmath.c:36:11: fatal error: 'gmp.h' file not found

# include <gmp.h>

      ^

1 error generated.

error: command '/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain    /usr/bin/clang' failed with exit status 1

----------------------------------------
Command /usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python -c "import setuptools;__file__='/var/folders/ym/v8l23q_x2xz_qhx3m84n6ym00005fr/T/pip-build/pycrypto/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/ym/v8l23q_x2xz_qhx3m84n6ym00005fr/T/pip-Xb7nGV-record/install-record.txt --single-version-externally-managed failed with error code 1 in /var/folders/ym/v8l23q_x2xz_qhx3m84n6ym00005fr/T/pip-build/pycrypto
Storing complete log in /Users/me/.pip/pip.log

The error when I try to call Fabric:

Traceback (most recent call last):
  File "/usr/local/share/python/fab", line 5, in <module>
from pkg_resources import load_entry_point
  File "/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/distribute-0.6.28-py2.7.egg/pkg_resources.py", line 2815, in <module>
working_set.require(__requires__)
  File "/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/distribute-0.6.28-py2.7.egg/pkg_resources.py", line 690, in require
needed = self.resolve(parse_requirements(requirements))
  File "/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/distribute-0.6.28-py2.7.egg/pkg_resources.py", line 588, in resolve
raise DistributionNotFound(req)
pkg_resources.DistributionNotFound: pycrypto>=2.1,!=2.4