Handy hints for Android development!
On a 64 bit install I couldn't get my project building, it came up with a cryptic message that aapt would was missing. It's a packaging tool and it was an executable that was exactly in the place it was supposed to be. Oddly enough it didn't run from the command line either and with an arcane message of FILE NOT FOUND.
The Anroid build tools I'd installed are 32 bit versions. They won't work without 32 bit installs of glibc and libc++
It was a bit of a pain figuring out that was the problem but once I had it was easily fixed. Tada!
sudo apt-get install lib32stdc++6 lib32z1