I'm getting the same test failure I got with RC1, as reported in [perl #117967]: % ./perl -MTestInit ext/GDBM_File/t/fatal.t 1..8 ok 1 - use GDBM_File; ok 2 - Can find next available file descriptor ok 3 - Check that we cannot open fileno 3. $! is Bad file descriptor ok 4 - The object isa GDBM_File ok 5 - dup fileno 3 ok 6 - close fileno 3, out from underneath the GDBM_File ok 7 - Trapped error when attempting to write to knobbled GDBM_File ok 8 - expected error message from GDBM_File Illegal instruction I get this with both cc and gcc: % cc --version Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn) % gcc --version i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00) This is on MacOSX 10.8.3 on a 2010 MacBook Pro. I'm a bit busy today, but happy to try things under direction, if helpful. NeilThread Next