diff --git a/configure.ac b/configure.ac
index 41bff98..da8ccf2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -27,6 +27,7 @@ AC_CHECK_HEADERS([getopt.h])
 AC_CHECK_FUNCS([memcpy basename vsnprintf strlcat])
 AC_CHECK_FUNCS([fdatasync])
 AC_CHECK_FUNCS([fpathconf sysconf posix_memalign posix_fadvise])
+AC_SEARCH_LIBS([clock_gettime],[rt])
 AC_CHECK_HEADERS([limits.h])
 AC_CHECK_HEADERS([wctype.h])
 AC_CHECK_HEADERS([termios.h])