diff --git a/lib/cpp/configure.ac b/lib/cpp/configure.ac
index a269df6..77a4f32 100644
--- a/lib/cpp/configure.ac
+++ b/lib/cpp/configure.ac
@@ -34,6 +34,10 @@
 
 AC_CHECK_LIB(pthread, pthread_create)
 
+AC_CHECK_LIB(rt, sched_get_priority_min)
+
+AC_CHECK_FUNCS([clock_gettime])
+
 AC_C_CONST
 
 AC_C_VOLATILE