duongtu wrote: > Please help me fix this Error or tell me which is the best stable configure for making GCC 4.4 in Cygwin The prototype for strsignal was changed in both libiberty and newlib. You're trying to build a newer libiberty with the change against older newlib headers without the change. You can use a snapshot version of Cygwin with the update (which was from 2008-06-17) or you can just make the change in the header. <http://sourceware.org/ml/newlib/2008/msg00342.html> Brian