Mike Gran <spk121@yahoo.com> wrote:
> Cygwin: use gcc or clang, link to a special C and POSIX library that handles the Windows API for you.
> Its emulation library is GPL[ed]

Really?  I was under impression, that it is under a _weakened_ variant of _Lesser_ GPL, i. e. its terms are even less restrictive that those of GNU libc.

> so to distribute a Cygwin app, it must be GPL[-compatible]

After all, Cygwin itself (just like any other GNU distro) have always distributed quite a few of GPL-incompatible software, so that statement does not look plausible at all.