> When running ./configure script under MSYS shell, in 
> resulting config.h the macro HAVE_GL_OVERLAY is defined as 
> HAVE_OVERLAY, resulting to zero.
> However under MS Visual Studio, where custom config.h is 
> used, HAVE_GL_OVERLAY is hard-defined as 1.
> 
> My question is, should ./configure scrip on windows (or 
> cross-compiling for windows) produce HAVE_GL_OVERLAY as 1 too?
> 
> Using fltk-1.1.10 under msys/mingw.

Hmm, not sure.

The overlay stuff was pretty SGI specific (though that may no longer be
the case, of course, and may not be relevant for Windows at all!), so
setting it to 0 is probably safer.

Maybe the question ought to be why the VS files have it hard-coded to 1,
then?

Anybody know about the goodness (or otherwise) of overlay support on
Windows graphics drivers?

What is a sensible default for this?




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