diff --git a/configure.ac b/configure.ac
index 6587015..d0403da 100644
--- a/configure.ac
+++ b/configure.ac
@@ -22,6 +22,8 @@ AC_PROG_CC
 AC_PROG_CPP
 AM_PROG_CC_C_O
 
+m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
+
 ACX_USE_SYSTEM_EXTENSIONS
 
 AC_PROG_LIBTOOL