> ./configure should work if GMP is installed in /usr/local. Maybe it is a problem of incompatible CC && CFLAGS on Solaris. Keep your GMP source/build directory, and try this. ./configure --with-gmp-build=YOUR_GMP_SOURCE_AND_BUILD_DIRECTORY to let MPFR grab CC and CFLAGS from GMP's Makefile. -- Patrick Pelissier