Hi, I was trying to build guile on my mac OS. When I tried to configure it with the command bash-3.2# ./../../gcc-requiredlib-4.5.1/guile-1.8.5/configure --with-gmp=/Users/gauravgoel/gcc-requiredlibbuild-4.5.1/gmp-5.0.1-build/gmp-5.0.1-install/ --prefix=/Users/gauravgoel/gcc-requiredlibbuild-4.5.1/guile-1.8.5-build/guile-1.8.5-install/ --with-mpfr=/Users/gauravgoel/gcc-requiredlibbuild-4.5.1/mpfr-3.0.0-build/mpfr-3.0.0-install/ CFLAGS='-O2 -pedantic -m64 -mtune=core2 -march=core2' I got the error. I am attaching the config.log file with this mail. I hope, that will describe error more clearly. Waiting for your reply. Thanks, Gaurav