diff --git a/config/baseconfig.mk b/config/baseconfig.mk
--- a/config/baseconfig.mk
+++ b/config/baseconfig.mk
@@ -1,10 +1,10 @@
-includedir := $(includedir)/$(MOZ_APP_NAME)-$(MOZ_APP_VERSION)
-idldir = $(datadir)/idl/$(MOZ_APP_NAME)-$(MOZ_APP_VERSION)
+includedir := $(includedir)/$(MOZ_APP_NAME)
+idldir = $(datadir)/idl/$(MOZ_APP_NAME)
 installdir = $(libdir)/$(MOZ_APP_NAME)-$(MOZ_APP_VERSION)
 sdkdir = $(libdir)/$(MOZ_APP_NAME)-devel-$(MOZ_APP_VERSION)
 MOZILLA_SRCDIR = $(topsrcdir)/mozilla
 MOZDEPTH = $(DEPTH)/mozilla
 DIST = $(MOZDEPTH)/dist
 
 # We do magic with OBJ_SUFFIX in config.mk, the following ensures we don't
 # manually use it before config.mk inclusion