I get this error when I try to compile the C program using -mfpmath=387 switch error: the '387' unit is not supported with this instruction set Here is the CPU info Intel i5-5257U This is on Mac OSX -- View this message in context: http://gcc.1065356.n8.nabble.com/Error-with-mfpmath-387-switch-on-Mac-OSX-Intel-CPU-tp1355695.html Sent from the gcc - Help mailing list archive at Nabble.com.