There are 5 cygwin/mingw-related patches at: http://github.com/janneke/gub/tree/master/patches/ ghostscript-8.70-cygwin.patch ghostscript-8.70-gs_dll.patch ghostscript-8.70-make.patch ghostscript-8.70-windows-make.patch ghostscript-8.70-windows-wb.patch Note that the last one (the simpliest one, in fact), was the subject matter of bug 691441 . I think one of them is about --prefix, so shouldn't be integrated; the rest are interesting but looks invasive. I am filing this just so that this work is not forgotten and may be incoporated some how in the future.
There are some significant problem against msvc with ghostscript-8.70-windows-make.patch - I'll send them the fix and update to 9.00 anyhow.
I think some of these are fixed or redundant. Outstanding patches should be submitted as individual bugs, with patches against a recent GS version attached to the bugs.