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The clock_gettime() is found in libc on modern systems, except on Solaris <= 10 and possible similar systems, it is in the rt library. This checks if clock_gettime() exists in the libc, then it checks if rt library has clock_gettime, prepends it to LIBS and defines the HAVE_CLOCK_GETTIME symbol with the template from the AC_CHECK_FUNCS. The ac_cv_func_clock_gettime is a cache variable set by AC_CHECK_FUNCS.