--- XCalibrate/configure.ac.orig	2006-03-08 14:57:07.000000000 +0100
+++ XCalibrate/configure.ac	2006-03-08 14:57:14.000000000 +0100
@@ -7,7 +7,7 @@
 AC_PROG_LIBTOOL
 
 # Check for X
-PKG_CHECK_MODULES(XCALIBRATE, x11 xextensions xcalibrateext)
+PKG_CHECK_MODULES(XCALIBRATE, x11 xextproto xcalibrateext)
 		  
 AC_OUTPUT([Makefile
            xcalibrate.pc])