depends. If you jump onto debian and do apt-get gnat you'll pull down the FSF distribution. The FSF standard library/runtime is under the GNAT-modified gpl whi

depends. If you jump onto debian and do apt-get gnat you'll pull down the FSF distribution. The FSF standard library/runtime is under the GNAT-modified gpl which is basically the LGPL and you can use it commercially. I think it's usually about 18 months behind Adacore's version but the standard library is very mature so it's not actually an issue. Much like there's no real problem using an older C standard library on Debian Stable or RHEL. It hasn't been updated for the recent gnat-5 release but more info here: https://people.debian.org/~lbrenta/debian-ada-policy.html https://people.debian.org/~lbrenta/debian-ada-policy.html