Hi, I've released libmpdec-2.4.0, which can be used to compile _decimal with the "--with-system-libmpdec" configure option: http://www.bytereef.org/mpdecimal/download.html libmpdec-2.4.0 is exactly the same as the one in the CPython source tree. The API is stable and the libmpdec-2.x.y series will stay binary compatible [1]. Stefan Krah [1] Starting from 2.4.0: 2.4.0 is not binary compatible with 2.3.