--- midisport-firmware-1.2.orig/configure.ac	2006-03-05 22:01:45.000000000 +0100
+++ midisport-firmware-1.2/configure.ac	2013-01-06 22:08:40.479938650 +0100
@@ -1,9 +1,12 @@
 # Process this file with autoconf to produce a configure script
 AC_PREREQ(2.0)
 AC_INIT(midisport-firmware, 1.2, [usb-midi-fw-user@lists.sourceforge.net])
-AM_INIT_AUTOMAKE($PACKAGE_NAME, $PACKAGE_VERSION)
+AM_INIT_AUTOMAKE
 AC_REVISION($Revision$)
 AC_CONFIG_SRCDIR(MidiSportLoader.ihx)
+m4_ifndef([PKG_PROG_PKG_CONFIG],
+    [m4_fatal([pkg-config is required])])
+PKG_PROG_PKG_CONFIG
 
 AC_ARG_WITH([fxload],
 	    AS_HELP_STRING([--with-fxload=name],
@@ -22,17 +25,8 @@
   AC_MSG_ERROR([$FXLOAD not found; please install the fxload package first])
 fi
 
-AC_MSG_CHECKING([for udev version])
-udev_ver=`udevinfo -V | awk '{ print $3 }'`
-if test -n "$udev_ver"; then
-  AC_MSG_RESULT([$udev_ver])
-else
-  AC_MSG_RESULT([none])
-  udev_ver="0"
-fi
-if test "$udev_ver" -lt 057; then
-  AC_MSG_ERROR([udev version 057 or later is required])
-fi
+PKG_CHECK_MODULES([udev], [udev >= 057], [], [
+	AC_MSG_ERROR(["udev of at least version 057 is required"])])
 
 AC_ARG_WITH([udev],
 	    AS_HELP_STRING([--with-udev=dir],