Index: trunk/FACT++/configure.ac
===================================================================
--- trunk/FACT++/configure.ac	(revision 19054)
+++ trunk/FACT++/configure.ac	(revision 19055)
@@ -9,5 +9,5 @@
 #[AC_]PACKAGE_BUGREPORT
 AC_INIT([FACT++],[1.0],[thomas.bretz@phys.ethz.ch],[FACTpp],[https://www.fact-project.org/svn/trunk/FACT++/])
-AC_PREREQ([2.65])
+AC_PREREQ([2.63])
 AC_CONFIG_FILES([Makefile])   # causes x/Makefile.in to be created if x/Makefile.am exists
 #AC_CONFIG_HEADERS([config.h])
@@ -75,5 +75,5 @@
 ######################################################################
 
-AM_PROG_AR
+m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
 LT_INIT([disable-static])
 AC_LANG(C++)