diff --git a/config.h.in b/config.h.in
index 6d36204..29d9d95 100644
--- a/config.h.in
+++ b/config.h.in
@@ -12,6 +12,9 @@
 /* Define to 1 if you have the `m' library (-lm). */
 #undef HAVE_LIBM
 
+/* Define to 1 if you have the `rt' library (-lrt). */
+#undef HAVE_LIBRT
+
 /* Define to 1 if you have `z' library (-lz) */
 #undef HAVE_LIBZ
 
diff --git a/configure b/configure
index 12bbf78..bb6b60b 100755
--- a/configure
+++ b/configure
@@ -3271,6 +3271,51 @@ _ACEOF
 
   LIBS="-lm $LIBS"
 
+fi
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for clock_gettime in -lrt" >&5
+$as_echo_n "checking for clock_gettime in -lrt... " >&6; }
+if ${ac_cv_lib_rt_clock_gettime+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lrt  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char clock_gettime ();
+int
+main ()
+{
+return clock_gettime ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_rt_clock_gettime=yes
+else
+  ac_cv_lib_rt_clock_gettime=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_rt_clock_gettime" >&5
+$as_echo "$ac_cv_lib_rt_clock_gettime" >&6; }
+if test "x$ac_cv_lib_rt_clock_gettime" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBRT 1
+_ACEOF
+
+  LIBS="-lrt $LIBS"
+
 fi
 
 
diff --git a/configure.ac b/configure.ac
index 64a0cbe..f7f4dba 100644
--- a/configure.ac
+++ b/configure.ac
@@ -14,6 +14,7 @@ AC_PROG_CC
 AC_PROG_INSTALL
 
 AC_CHECK_LIB([m], [sqrt])
+AC_CHECK_LIB([rt], [clock_gettime])
 AX_CHECK_OPENSSL(,[AC_MSG_ERROR([No openssl found])])
 AX_CHECK_ZLIB(, [AC_MSG_ERROR([No zlib found])])