--- a/config/autoconf.mk.in
+++ b/config/autoconf.mk.in
@@ -74,8 +74,8 @@
 mandir		= @mandir@
 idldir		= $(datadir)/idl/$(MOZ_APP_NAME)-$(MOZ_APP_VERSION)
 
-installdir	= $(libdir)/$(MOZ_APP_NAME)-$(MOZ_APP_VERSION)
-sdkdir		= $(libdir)/$(MOZ_APP_NAME)-devel-$(MOZ_APP_VERSION)
+installdir	= $(libdir)/$(MOZ_APP_NAME)
+sdkdir		= $(libdir)/$(MOZ_APP_NAME)-devel
 
 DIST		= $(DEPTH)/dist
 LIBXUL_SDK      = @LIBXUL_SDK@
diff -Nur a/js/src/config/autoconf.mk.in b/js/src/config/autoconf.mk.in
--- a/js/src/config/autoconf.mk.in
+++ b/js/src/config/autoconf.mk.in
@@ -60,8 +60,8 @@
 datadir		= @datadir@
 mandir		= @mandir@
 
-installdir	= $(libdir)/$(MOZ_APP_NAME)-$(MOZ_APP_VERSION)
-sdkdir		= $(libdir)/$(MOZ_APP_NAME)-devel-$(MOZ_APP_VERSION)
+installdir	= $(libdir)/$(MOZ_APP_NAME)
+sdkdir		= $(libdir)/$(MOZ_APP_NAME)-devel
 
 TOP_DIST	= @TOP_DIST@
 ifneq (,$(filter /%,$(TOP_DIST)))