From 216caee1b3b707621522e88c9ebf230ce6366843 Mon Sep 17 00:00:00 2001
From: Arnaud Kapp <kapp.arno@gmail.com>
Date: Tue, 21 Oct 2014 22:24:16 +0200
Subject: [PATCH] Improve build script error checking.

This commit adds a check to make sure pkg-config is present on the
computer building libzmq.
This particular line was stolen from the debian mailing list.
See https://lists.debian.org/debian-dpkg/2011/04/msg00054.html
---
 configure.ac | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configure.ac b/configure.ac
index aacb0ef0..a23af7a0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -49,6 +49,7 @@ AM_PROG_CC_C_O
 AC_PROG_SED
 AC_PROG_AWK
 PKG_PROG_PKG_CONFIG
+m4_pattern_forbid([^PKG_[A-Z_]+$], [missing some pkg-config macros (pkg-config package)])
 
 # Libtool configuration for different targets. See acinclude.m4
 AC_ARG_VAR([XMLTO], [Path to xmlto command])