diff --git a/configure.ac b/configure.ac
index cc89593..5941cd8 100755
--- a/configure.ac
+++ b/configure.ac
@@ -549,6 +549,8 @@
 AC_CHECK_FUNCS([clock_gettime])
 AC_CHECK_FUNCS([sched_get_priority_min])
 AC_CHECK_FUNCS([sched_get_priority_max])
+AC_CHECK_FUNCS([inet_ntoa])
+AC_CHECK_FUNCS([pow])
 
 if test "$cross_compiling" = "no" ; then
   AX_SIGNED_RIGHT_SHIFT