They failed with: === === If you get failures below, please file a bug describing the error === and your environment (compiler and linker versions), and use === --disable-elf-hack until this is fixed. === # Fail if the library doesn't have INIT_ARRAY .dynamic info readelf -d test-array.so | grep '(INIT_ARRAY)' 0x00000019 (INIT_ARRAY) 0x54a8 /builds/slave/rel-m-beta-lnx-rpk-2/mozilla-beta/obj-l10n/build/unix/elfhack/elfhack -b -f test-array.so /builds/slave/rel-m-beta-lnx-rpk-2/mozilla-beta/obj-l10n/build/unix/elfhack/elfhack: /tools/gcc-4.3.3/installed/lib/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by /builds/slave/rel-m-beta-lnx-rpk-2/mozilla-beta/obj-l10n/build/unix/elfhack/elfhack) make[4]: *** [test-array.so] Error 1 I landed this fix to fix them, at catlee's suggestion: https://hg.mozilla.org/build/buildbot-configs/rev/e0994e97bf3a