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Try adding it to CFLAGS.

Oh yuck -- you need to contemplate my signature Jeff. The gprof man page is one of many still used in the FIFTH CIRCLE OF HELL!!!

Okay, here's how to use gprof:

1) compile: gcc -pg -fprofile-arcs -ftest-coverage
2) now run the executable once, this will create a file "gmon.out"
3) then gprof -b ./a.out (or the exe name).