gentoo-overlay/sys-apps/baselayout-prefix/files/baselayout-1.12.5-prefix-chaining-pkgconfig.patch

diff -ru baselayout-1.12.5.orig/etc/profile baselayout-1.12.5/etc/profile
--- baselayout-1.12.5.orig/etc/profile	2009-07-14 09:48:59 +0200
+++ baselayout-1.12.5/etc/profile	2009-07-14 09:50:48 +0200
@@ -30,8 +30,11 @@
 if [[ -n "${_ro_root}" ]]; then
 	_ro_chained_path_vars="PATH MANPATH"
 
-	[[ ${_ro_deps} == *RDEPEND* ]] && 
+	if [[ ${_ro_deps} == *RDEPEND* ]]; then
 		_ro_chained_path_vars="${_ro_chained_path_vars} PKG_CONFIG_PATH"
+	else
+		unset PKG_CONFIG_PATH
+	fi
 
 	for var in ${_ro_chained_path_vars}; do
 		eval "_ro_backupenv_paths_${var}=\${${var}}"