diff --git a/lib/cpp/configure.ac b/lib/cpp/configure.ac
index 878e55a..9802096 100644
--- a/lib/cpp/configure.ac
+++ b/lib/cpp/configure.ac
@@ -106,4 +106,6 @@
 
 AC_PROG_LIBTOOL
 
+AC_PROG_MAKE_SET
+
 AC_OUTPUT(Makefile)