echo 'Creating brew-patch.diff'
cat << EOF >> brew-patch.diff
diff --git a/configure.ac b/configure.ac
index 8d28d78..2bfe06f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -8,6 +8,7 @@ AM_INIT_AUTOMAKE([-Wall -Werror])
 AC_PROG_CXX
 AC_LIBTOOL_DLOPEN
 AC_PROG_LIBTOOL
+AM_PROG_AR

 AC_CHECK_PROGS(DOXYGEN, doxygen, false)
 AM_CONDITIONAL([COND_DOXYGEN], [test "$DOXYGEN" != "false"])
EOF