Here's my config: g++ -v Reading specs from /usr/local/appl/gcc-3.4.1/lib/gcc/hppa2.0w-hp-hpux11.11/3.4.1/specs Configured with: ../gcc-3.4.1/configure --prefix=/usr/local/appl/gcc --with-as=/usr/local/appl/binutils/bin/as --enable-threa ds=posix Thread model: posix gcc version 3.4.1 I wanted to change the specs so that -D_INCLUDE__STDC_A1_SOURCE is defined everytime the precompiler is invoked, so I modify the cpp entry in the specs file as follows: *cpp: -D_INCLUDE__STDC_A1_SOURCE %{mt|pthread:-D_REENTRANT -D_THREAD_SAFE -D_POSIX_C_SOURCE=199506L} But it doesn't appear to be working. Is there something wrong with my syntax or am I missing something? Thanks! -Jerry