63.1.2 The BSD multi-precision library

The BSD-MP library comes natively (as the name maybe suggests) with BSD distributions. It is also widely, though mostly stealthily, spread in form of the crypto library libcrypto.so of OpenSSL.

BSD-MP, like GMP, provides a form of arbitrary-precision rational integers, called MINT. Both MPZ and MINT integers are transparently unified within SXEmacs, which is why you can use only one implementation at a time.