diff --git a/configure.ac b/configure.ac
index acd5843..f5ad65d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -26,6 +26,7 @@ AC_PROG_CC
 AC_PROG_INSTALL
 AC_PROG_LN_S
 AC_PROG_RANLIB
+AM_PROG_AR
 
 dnl Checks for libraries.
 AC_CHECK_FUNC([gethostent], :, [AC_CHECK_LIB(nsl, gethostent)])