From 3b9259f7cedc179617bc24b3912d2d8d75c5a824 Mon Sep 17 00:00:00 2001
From: Ian Stakenvicius <axs@gentoo.org>
Date: Fri, 14 Sep 2012 21:04:42 +0100
Subject: configure: Make udev dependency optional

In order to support buildbots where the udev headers may exist on the
build system but not the target, we need explicit control over optional
dependencies.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=54942
---
 configure.ac | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index f94f1401..2d651e1a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -85,9 +85,20 @@ fi
 PKG_CHECK_MODULES(GEN4ASM, [intel-gen4asm >= 1.2], [gen4asm=yes], [gen4asm=no])
 AM_CONDITIONAL(HAVE_GEN4ASM, test x$gen4asm = xyes)
 
-PKG_CHECK_MODULES(UDEV, [libudev], [udev=yes], [udev=no])
-if test x"$udev" = xyes; then
-	AC_DEFINE(HAVE_UDEV,1,[Enable udev-based monitor hotplug detection])
+AC_ARG_ENABLE(udev,
+              AS_HELP_STRING([--disable-udev],
+                             [Disable udev-based monitor hotplug detection [default=auto]]),
+              [UDEV="$enableval"],
+              [UDEV=auto])
+
+if test x$UDEV != "xno"; then
+	PKG_CHECK_MODULES(UDEV, [libudev], [udev=yes], [udev=no])
+	if test x$UDEV == xyes -a x$udev != xyes; then
+		AC_MSG_ERROR([udev support requested but not found (libudev)])
+	fi
+	if test x$udev = xyes; then
+		AC_DEFINE(HAVE_UDEV,1,[Enable udev-based monitor hotplug detection])
+	fi
 fi
 
 PKG_CHECK_MODULES(X11, [x11 xrender xext pixman-1], [x11=yes], [x11=no])
-- 
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