When I use the gcc or gfortran command to attempt to compile a *.f95 file (in Terminal in Mac OS X 10.5.3): ls-mbook:FORTRAN lsailer$ gcc srcpnl.f95 /usr/bin/ld: warning unknown -macosx_version_min parameter value: 10.5.3 ignored (using 10.4) /usr/bin/ld: /usr/lib/libSystem.dylib unknown flags (type) of section 6 (__TEXT,__literal16) in load command 0 /usr/bin/ld: /usr/lib/libSystem.B.dylib unknown flags (type) of section 6 (__TEXT,__literal16) in load command 0 collect2: ld returned 1 exit status Afterwhich it exits. Any help would be appreciated, L Sailer