fatal error: 'gmp.h' file not found

Trying to install pycrypto > 2.2 and hit this bug[1]. Here is the fix:

1. Go here and install the latest version following these instructions:

http://math.digi2.jp/math/mp/mpfr/install.html

2. Create this symlink

sudo ln -s /usr/local/include/gmp.h /usr/include/gmp.h

3. pip install pycrypto==2.2

Done :)

[1]

building 'Crypto.PublicKey._fastmath' extension

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -fno-strict-aliasing -fno-common -dynamic -pipe -march=native -mmacosx-version-min=10.7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk -isystem /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk/usr/include -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk/usr/include -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk/usr/X11/include -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-10.7-x86_64-2.7/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