IIRC FSF's position on this is that the original author has to include inlude explicit GPL exemption for things like MFC, VCL or even OpenSSL, if the program de

IIRC FSF's position on this is that the original author has to include inlude explicit GPL exemption for things like MFC, VCL or even OpenSSL, if the program depends on them, in order for anyone to be legally able to distribute binaries. I would assume that something similar comes into play when building the program requires proprietary compiler that is not "component of the operating system" (although in that case it might very well be implied). That in practice nobody except FSF and Debian cares is another thing.