Sunbird nightly builds fail with the following errors: make[6]: Entering directory `/e/buildbot/comm-central-sunbird-win32-nightly/build/mozilla/layout/generic' make[6]: Leaving directory `/e/buildbot/comm-central-sunbird-win32-nightly/build/mozilla/layout/generic' NEXT ERROR make[6]: *** No rule to make target `export'. Stop. make[5]: *** [generic_export] Error 2 make[5]: *** Waiting for unfinished jobs.... make[6]: Entering directory `/e/buildbot/comm-central-sunbird-win32-nightly/build/mozilla/layout/tables' make[6]: Leaving directory `/e/buildbot/comm-central-sunbird-win32-nightly/build/mozilla/layout/tables' NEXT ERROR make[6]: *** No rule to make target `export'. Stop. make[5]: *** [tables_export] Error 2 make[5]: Leaving directory `/e/buildbot/comm-central-sunbird-win32-nightly/build/objdir-tb/mozilla/layout' make[4]: Leaving directory `/e/buildbot/comm-central-sunbird-win32-nightly/build/objdir-tb/mozilla' make[4]: *** [export_tier_gecko] Error 2 make[3]: *** [tier_gecko] Error 2 make[2]: *** [default] Error 2 make[1]: Leaving directory `/e/buildbot/comm-central-sunbird-win32-nightly/build/objdir-tb' make[1]: *** [default] Error 2 make: *** [build] Error 2

Bug 462730 mentions a similar issue for xulrunner when using -j19 option Sunbird uses mk_add_options MOZ_MAKE_FLAGS="-j6" resp. "-j3": http://hg.mozilla.org/build/buildbot-configs/file/cb6db3dbdcd9/thunderbird/win32/mozconfig-sunbird http://hg.mozilla.org/build/buildbot-configs/file/cb6db3dbdcd9/thunderbird/macosx/mozconfig-sunbird http://hg.mozilla.org/build/buildbot-configs/file/cb6db3dbdcd9/thunderbird/linux/mozconfig-sunbird

In Bug 462447 I suggest removing the -j6 option. Maybe will help for this bug, adding dependency.

I think this is a dupe, given your use of -j6.