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From: Paul Rubin <no.email@nospam.invalid>
Newsgroups: comp.lang.python
Subject: Re: warning: GMP or MPIR library not found; Not building Crypto.PublicKey._fastmath.
Date: Thu, 22 Oct 2015 23:12:30 -0700
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caspar@walboomers.nl writes:
>     warning: GMP or MPIR library not found; Not building Crypto.PublicKey._fastmath.
> How to fix this problem? Or should I run another (lower) version of python?

See if the program works anyway without _fastmath.  It would use the
built-in Python arithmetic which is slower but usable unless you have
high performance requirements.  According to my benchmarks (a long time
ago on a 32-bit x86) GMP was about 4x faster than Python's bigints.  But
your program isn't likely to spend that much of its time doing bignum
math.