http://stackoverflow.com/questions/1426 ... ion-min-10
So the problem really comes from using different versions of the OS. I'll compile with -mmacosx-version-min=10.5 from now on, but I just can't recompile all my other binaries in order to support old versions of the OS... I'll recompile those engines though.I get Illegal Instruction: 4 errors with binaries compiled with GCC 4.7.2 under Mac OS X 10.8.2 ("Mountain Lion"), when those binaries are run under Mac OS X 10.7.x ("Lion") and earlier versions. The binaries work properly under Mac OS X 10.8.x.
I added -mmacosx-version-min=10.5 to my compile flags and this seems to help resolve the issue for 10.5.x, 10.6.x and 10.7.x clients, whatever that issue is.
[Edit:] as you said you had no problems with my older compiles, I guess I can recompile the recent ones only (so about 40/50 engines to recompile.) This is still doable.

