configure: Use AM_PROG_AR if available (needed by Automake 1.12)

Signed-off-by: Anders Kaseorg <andersk@mit.edu>

diff --git a/configure.ac b/configure.ac
index f3a05d9a0215fc94496fc703754f1bde29db2429..317c921fcd57ac01466723c9da9e0c695237553a 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -6,6 +6,7 @@ m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])
 AC_PREFIX_DEFAULT([/])
 AC_DISABLE_STATIC
 AC_PROG_CC
 AC_PREFIX_DEFAULT([/])
 AC_DISABLE_STATIC
 AC_PROG_CC

+m4_ifdef([AM_PROG_AR], [AM_PROG_AR])

 AC_PROG_LIBTOOL
 
 AC_HEADER_STDBOOL
 AC_PROG_LIBTOOL
 
 AC_HEADER_STDBOOL