diff --git a/configure.ac b/configure.ac
index 3845f2eea..a97ee967f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -219,6 +219,8 @@ AC_CHECK_TOOL(STRIP, strip)
 AC_PROG_INSTALL
 AC_PROG_LN_S
 
+AC_PATH_PROG(CMP, cmp)
+
 #
 # Checks for specific compiler characteristics
 #