--- Makefile.in 2012-11-02 10:18:21.533753077 +0100
+++ Makefile.in	2012-11-01 23:39:24.000000000 +0100
@@ -45,6 +45,7 @@
 the menu in Tools > Add-ons and click enable where you see LibreJS. \
 "
 
+CFX_ARGS =
 
 all: xpi
 
@@ -99,7 +100,7 @@
 xpi: librejs.xpi
 
 librejs.xpi:
-	cd $(ADDON_SDK) && source bin/activate && cd - && cfx xpi
+	cd $(ADDON_SDK) && source bin/activate && cd - && cfx $(CFX_ARGS) xpi
 
 doc/librejs.info: $(srcdir)/doc/librejs.texi
 	$(MAKEINFO) -o $(srcdir)/doc/librejs.info $(srcdir)/doc/librejs.texi

--- configure.ac        2012-11-02 12:10:59.928024855 +0100
+++ configure.ac        2012-11-02 12:13:06.998042341 +0100
@@ -4,4 +4,6 @@
 AC_PATH_PROG([MAKEINFO], makeinfo)
 AC_PATH_PROG([TEXI2DVI], texi2dvi)
 AC_PATH_PROG([TEXI2PDF], texi2pdf)
-AC_ARG_VAR([ADDON_SDK], [location of the Mozilla addon-sdk])
+ 
+AC_ARG_VAR([ADDON_SDK], [location of the Mozilla addon-sdk (default=/opt/addon-sdk)])
+AC_ARG_VAR([CFX_ARGS], [build arguments to pass to cfx])

 AC_CONFIG_FILES([Makefile])

 AC_OUTPUT