build: do not fail if AM_PROG_AR is not known

diff --git a/configure.ac b/configure.ac
index 1fef8ebe966fa57bbba2fa480846ee3d4c39765f..2fabb94fd4a4064fc44aaafc14f0977219786102 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -3,10 +3,10 @@ AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_MACRO_DIR([m4])
 AC_PROG_INSTALL
-AM_INIT_AUTOMAKE([1.12 -Wall foreign subdir-objects])
+AM_INIT_AUTOMAKE([1.10b -Wall foreign subdir-objects])
 AC_PROG_CC
 AM_PROG_CC_C_O
-AM_PROG_AR
+m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
 AC_DISABLE_STATIC
 AC_PROG_LIBTOOL