I've followed the instructions given at http://www.rubymotion.com/developer-center/guides/getting-started but when I get to the instruction Rake device
I get the error:
ERROR! It looks like your version of the NDK does not support API level . Switch to a lower API level or install a more recent NDK.
It seems when other people get this error they're given an API level (level L seems to be a popular problem causer).
I've tried with a few different versions of NDK (9d, 10, 10b) and SDK (19, 20, L) but no luck.
I simply uninstalled all the Android L stuff from my "Android SDK Manager" entirely. Worked after that.
(I might have had to remove Android 20 as well -- not near my Android development Mac atm)