Also, I presume it's available on Win32 with msys2?
I haven't checked, but if webkitgtk is deprecated upstream, I would presume so too.
According to [here](https://github.com/msys2/msys2/wiki/Packages), they have 2.4.11. I'm not sure how their version numbering scheme works, whether that's `webkit2gtk` or not.
Would it not be worthwhile to just add a couple #ifdefs to support both versions?
I would rather not -- it seems like it would be a really annoying process and very dirty to do.
From what I can see, for Markdown, it would only be at most 6 `#ifdef`s, and could probably be further reduced. Your PR has very minimal changes to the Markdown plugin.