from http://gmplib.org/

Most problems with compiling GMP these days are due to problems not in GMP, but with the compiler. In the past, system compilers caused the most trouble, but in the last years, gcc has gradually caused more and more trouble. On these pages we don't list compiler problems, just problems with the GMP code itself. To save you some time, we suggest that you cut any compiler error message and paste it into your favourite web search engine before you report problems to the GMP bug report list.