Geoff, I just install Xcode 2.4 and compiling the modulo.c testcase still fails to link...
[Jack-Howarths-Computer:~] howarth% gcc -m64 modulo.c Undefined symbols: ___modti3, referenced from: _main in ccXflrzz.o ld64-59.2 failed: symbol(s) not found collect2: ld returned 1 exit status so I guess the fix doesn't exist in that version of the Apple gcc branch. Jack