From fd8563328c4109529383babb0d7518ee6e49ba04 Mon Sep 17 00:00:00 2001
From: Peter Rajnoha <prajnoha@redhat.com>
Date: Fri, 11 Sep 2009 15:55:07 +0000
Subject: [PATCH] Add libudev configuration check.

---
 WHATS_NEW    |  1 +
 configure.in | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/WHATS_NEW b/WHATS_NEW
index b5f63a7e9..f9a263b9f 100644
--- a/WHATS_NEW
+++ b/WHATS_NEW
@@ -1,5 +1,6 @@
 Version 2.02.52 -
 =================================
+  Add libudev configuration check.
   Add lvm2app.sh to nightly tests conditional upon configure --enable-applib.
   Update lvm_vg_remove to require lvm_vg_write to commit remove to disk.
   Enforce an alphabetical lock ordering for vgname locks.
diff --git a/configure.in b/configure.in
index cc461cf6c..525459079 100644
--- a/configure.in
+++ b/configure.in
@@ -650,6 +650,20 @@ AC_ARG_ENABLE(udev_rules, [  --enable-udev_rules     Install rule files needed f
 UDEV_RULES=$enableval, UDEV_RULES=$UDEV_SYNC)
 AC_MSG_RESULT($UDEV_RULES)
 
+################################################################################
+dnl -- Check for libudev's udev_queue_get_udev_is_active function when udev synchronisation is enabled
+
+if test x$UDEV_SYNC = xyes; then
+	AC_CHECK_LIB(udev, udev_queue_get_udev_is_active, HAVE_UDEV_QUEUE_GET_UDEV_IS_ACTIVE=yes,
+		HAVE_UDEV_QUEUE_GET_UDEV_IS_ACTIVE=no)
+
+		if test x$HAVE_UDEV_QUEUE_GET_UDEV_IS_ACTIVE = xyes; then
+			AC_DEFINE([HAVE_UDEV_QUEUE_GET_UDEV_IS_ACTIVE], 1,
+			  [Define to 1 if libudev's udev_queue_get_udev_is_active function is available.])
+			LIBS="-ludev $LIBS"
+		fi
+fi
+
 ################################################################################
 dnl -- Compatibility mode
 AC_ARG_ENABLE(compat,   [  --enable-compat         Enable support for old device-mapper versions],