From: Juan Lang The main contributors that have not done so that I saw after a quick perusal were Alexandre and Rob Shearman. If you can't get their permission, you'd have to start with the last MIT/X11 licensed version, or get Transgaming's most recent ReWind version and start from there.
I had a look at msvcrt of the latest ReWind that is quite old but should be enough as well for the reqired parts. After examining the mixed-mode msvcrt (just the metadata not the code) I found that it contains little if any managed code so I will most likely be able to forward calls to a native msvcrt.
As a conclusion I think that there will be no licensing problems.
I'm not sure if you realise it, but Wine is licensed under the LGPL, not the GPL so I don't think using Wine's msvcrt code would be a problem with inlining and using non-GPL programs.
Inlining (done by the JIT at run time) is not just linking (that is permitted LGPL) and may not be permitted by LGPL.
Kornél