You can't use a lot of the libraries and still get the runtime exception to where it doesn't have to be released as GPL I think.

GNAT Community version does not offer support for old versions of Ada, GNAT Pro does, but at the same time GCC's Ada (gcc-ada is the package for Arch Linux, for example) supports all versions of Ada. Funny that. I cannot say I am completely happy with the way they are trying to get money.