--- configure.ac.orig	2014-05-01 10:44:01 UTC
+++ configure.ac
@@ -4,6 +4,7 @@ AC_PREREQ(2.61)
 AC_INIT([lcdproc], [0.5.7], [lcdproc@lists.omnipotent.net])
 AC_CONFIG_SRCDIR([clients/lcdproc/batt.c])
 AM_INIT_AUTOMAKE
+PKG_PROG_PKG_CONFIG()
 
 AC_CONFIG_HEADERS(config.h)
 
@@ -268,7 +269,7 @@ AC_MSG_RESULT($enable_libusb)
 
 if test "$enable_libusb" = "yes"; then
 	ifdef([PKG_CHECK_MODULES],
-		[PKG_CHECK_MODULES(LIBUSB, libusb,
+		[PKG_CHECK_MODULES(LIBUSB, libusb-0.1,
 			[AC_DEFINE(HAVE_LIBUSB, [1], [Define to 1 if you have libusb])],
 			[ enable_libusb=no ])],
 		[AC_MSG_WARN([pkg-config not (fully) installed; drivers requiring libusb may not be built])])