If you are trying to install pyhash (0.6.2) on Mac OS X 10.10 you might get the following error:
src/Hash.h:20:20: error: __int128 is not supported on this target typedef unsigned __int128 uint128_t;
Try to run the install command in the following way:
ARCHFLAGS="-arch x86_64" pip install pyhash
If you are still having problems regarding a boost library missing,
ld: library not found for -lboost_python-mt
You can use brew to install it.
brew install boost-python
You might need too install bsddb3 package also with pip if it complains that the library is missing.
pip install bsddb3