From 126c9b7b4b2c5f43b7d86f821bf5b7a416836a7e Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@gmail.com>
Date: Sun, 18 Sep 2011 16:41:46 -0400
Subject: Fix ./configure --{enable,disable}-png.

If the first call to PKG_CHECK_MODULES() doesn't happen, a
PKG_PROG_PKG_CONFIG is needed.
---
 configure.ac | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configure.ac b/configure.ac
index cd2af0a..06e9b0a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -35,6 +35,7 @@ AC_PROG_LN_S
 AC_PROG_MAKE_SET
 LT_INIT([win32-dll disable-static])
 AM_PATH_PYTHON([3.2])
+PKG_PROG_PKG_CONFIG
 
 dnl Find the math library
 AC_SEARCH_LIBS([sqrt], [m], [], [AC_MSG_ERROR([sqrt() function not found])])
-- 
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