diff -up thunderbird-31.0/comm-esr31/client.mk.old thunderbird-31.0/comm-esr31/client.mk

--- thunderbird-31.0/comm-esr31/client.mk.old	2014-07-18 02:04:05.000000000 +0200

+++ thunderbird-31.0/comm-esr31/client.mk	2014-07-30 10:57:01.177453550 +0200

@@ -131,7 +131,7 @@ endif

 ifndef MOZ_OBJDIR

-  MOZ_OBJDIR = obj-$(CONFIG_GUESS)

+  MOZ_OBJDIR = objdir

 else

 # On Windows Pymake builds check MOZ_OBJDIR doesn't start with "/"

   ifneq (,$(findstring mingw,$(CONFIG_GUESS)))

diff -up thunderbird-31.0/comm-esr31/mozilla/media/webrtc/trunk/Makefile.old thunderbird-31.0/comm-esr31/mozilla/media/webrtc/trunk/Makefile