Since a lot of people have been running into this, I figured I'd post it
here so people who haven't run into yet can pre-emptively fix it. As of
bug 739355, you need Android SDK r14 to build mozilla-central.
Attempting to build with r13 or lower will result in some build errors
relating to android:actionBarDivider.
To update to r14, modify your mozconfig's "--with-android-sdk" parameter
to point to <sdk>/platforms/android-14 instead of -13. (You should also
make sure your SDK has that folder; if not, you'll need to update your
SDK too). You will need to do a clobber build to pick up the change, so
keep some wooden swords handy. (
http://xkcd.com/303/)
Bug 759115 has a change that should catch this earlier in the build
process but that hasn't landed yet.
Cheers,
kats