diff -p -up ./extensions/source/plugin/util/makefile.pmk.orig3 ./extensions/source/plugin/util/makefile.pmk
--- extensions/source/plugin/util/makefile.pmk.orig3	2009-10-20 18:35:37.000000000 -0400
+++ extensions/source/plugin/util/makefile.pmk	2009-10-20 18:37:43.000000000 -0400
@@ -34,7 +34,9 @@ NOUNODOC=true
 
 .IF "$(SYSTEM_MOZILLA)" == "YES"
 CFLAGS+=-DSYSTEM_MOZILLA
-PKGCONFIG_MODULES+=$(MOZ_FLAVOUR)-plugin
+# our xulrunner devel package still has 
+# mozila-plugin.pc intead of xulrunner-plugin.pc
+PKGCONFIG_MODULES+=mozilla-plugin
 .ENDIF
 
 .IF "$(GUIBASE)" == "unx" && "$(ENABLE_GTK)" == "TRUE"