diff -urb ceph-0.51/configure.ac ceph-0.51b/configure.ac
--- ceph-0.51/configure.ac	2012-08-26 01:58:14.000000000 +0300
+++ ceph-0.51b/configure.ac	2012-09-24 09:19:20.791969694 +0300
@@ -17,6 +17,9 @@
 AC_CANONICAL_HOST
 AC_CANONICAL_TARGET
 
+# fix automake problems in 1.12
+m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
+
 # Automake
 AM_INIT_AUTOMAKE
 AM_PROG_CC_C_O