>>>>> Jubin writes: Jubin> Is it possible to compile GCC 3.0.4 on AIX 5.1 with POSIX thread support ? Jubin> I am using the source available at GNU site. No patch applied.. GCC 3.0.4 should work on AIX 5.1, including POSIX threads support. One invokes GCC with the "-pthread" flag to utilize pthreads. David