diff -up mozilla-aurora/config/baseconfig.mk.orig mozilla-aurora/config/baseconfig.mk
--- mozilla-aurora/config/baseconfig.mk.orig	2014-05-06 13:17:17.000000000 +0200
+++ mozilla-aurora/config/baseconfig.mk	2014-05-27 17:13:05.215503107 +0200
@@ -4,7 +4,7 @@
 # whether a normal build is happening or whether the check is running.
 includedir := $(includedir)/$(MOZ_APP_NAME)-$(MOZ_APP_VERSION)
 idldir = $(datadir)/idl/$(MOZ_APP_NAME)-$(MOZ_APP_VERSION)
-installdir = $(libdir)/$(MOZ_APP_NAME)-$(MOZ_APP_VERSION)
+installdir = $(libdir)/$(MOZ_APP_NAME)
 sdkdir = $(libdir)/$(MOZ_APP_NAME)-devel-$(MOZ_APP_VERSION)
 ifndef TOP_DIST
 TOP_DIST = dist