From 594debf27cc9acd8e287b23862dadae947359f47 Mon Sep 17 00:00:00 2001
From: Stephen Sinclair <sinclair@music.mcgill.ca>
Date: Sun, 22 Jul 2012 21:53:28 -0400
Subject: [PATCH] Ignore pkg-config-related m4 macros if they aren't available.

Taken from,
http://osdir.com/ml/automake-gnu/2011-03/msg00007.html

Signed-off-by: Stephen Sinclair <sinclair@music.mcgill.ca>
---
 configure.ac |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/configure.ac b/configure.ac
index 69cec8d..5c54223 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7,6 +7,20 @@ AC_CONFIG_FILES([rtaudio-config librtaudio.pc Makefile tests/Makefile])
 # Fill GXX with something before test.
 AC_SUBST( GXX, ["no"] )
 
+dnl Check for pkg-config program, used for configuring some libraries.
+m4_define_default([PKG_PROG_PKG_CONFIG],
+[AC_MSG_CHECKING([pkg-config])
+AC_MSG_RESULT([no])])
+
+PKG_PROG_PKG_CONFIG
+
+dnl If the pkg-config autoconf support isn't installed, define its
+dnl autoconf macro to disable any packages depending on it.
+m4_define_default([PKG_CHECK_MODULES],
+[AC_MSG_CHECKING([$1])
+AC_MSG_RESULT([no])
+$4])
+
 # Checks for programs.
 AC_PROG_CXX(g++ CC c++ cxx)
 AC_PROG_RANLIB
-- 
1.7.1