Thanks to Ryan Savitski: Some textual typos in readme.md, plus a benign bug when enumerating more than one platform: "vendor=platforms[0]" -> "vendor=platforms[i]".
Cygwin specific libraries. Cygwin64 fails when given a normal library (though
Cygwin32 links fine against OpenCL.lib), so these ones are in elf format.
Multiple minor fixes, thanks to Henry Poulton and others.
More tips.