This patch is Debian-specific, see bugs.debian.org/638016

--- xutils-dev-7.6+5/xorg-cf-files/gnu.cf	2011-08-16 16:06:57.000000000 +0200
+++ xutils-dev-7.6+5/xorg-cf-files/gnu.cf.new	2011-08-16 16:09:58.000000000 +0200
@@ -29,6 +29,13 @@
 # define GnuBinUtilsMajorVersion	DefaultGnuBinUtilsMajorVersion
 #endif
 
+#ifndef ProjectRoot
+# define ProjectRoot   /usr
+#endif
+#ifndef ManDirectoryRoot
+# define ManDirectoryRoot      /usr/share/man
+#endif
+
 XCOMM operating system:  OSName (OSMajorVersion./**/OSMinorVersion./**/OSTeenyVersion)
 XCOMM libc:	(GnuCLibMajorVersion./**/GnuCLibMinorVersion./**/GnuCLibTeenyVersion)
 XCOMM binutils:	(GnuBinUtilsMajorVersion)