Some operating systems such as OS/2 don't have any of the CLOCK* API
functions so add gettimeofday() as a fallback.
Signed-off-by: Dave Yeo <dave.r.yeo@gmail.com>
Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>
On some setups, benchmark_residual linkage fails with an undefined
reference to clock_gettime(). Adding -lrt fixes that.
Patch-from: Ozkan Sezer <sezeroz@gmail.com>
