Trying to compile current mozilla-central on Linux with X disabled: ac_add_options --without-x ac_add_options --enable-default-toolkit=cairo-qt 1:20.28 /home/morbo/hg/mozilla-central/config/config.mk:105: *** Variable LIBS is defined in /home/morbo/hg/mozilla-central/objdir-desktop/toolkit/library/build/Makefile. It should only be defined in moz.build files. Stop. 1:20.28 make[4]: *** [toolkit/library/build/export] Error 2 Bisected to: The first bad revision is: changeset: 195644:a0988e587a90 user: Mike Hommey <mh+mozilla@glandium.org> date: Wed Jul 23 13:31:02 2014 +0900 summary: Bug 1036894 part 9 - Replace all EXTRA_DSO_LDOPTS, SHARED_LIBRARY_LIBS and LIBS with EXTRA_LIBS, OS_LIBS or OS_LDFLAGS, appropriately. r=gps Related to bug 1042525 and Bug 966814. (Patch for the latter from that bug may be needed, and this bug blocks resolution of the former)