In the trunk version SVN-200902017 section 3.2 The download link for the mpfr lib is wrong : http://www.mpfr.org/mpfr-current/mpfr-2.4.0.tar.bz2 SHOULD BE http://www.mpfr.org/mpfr-current/mpfr-2.4.1.tar.bz2. 2.4.1 is the last version. Best regards Emmanuel Trillaud