Can't compile on Windows

[grisevg]

Ruby 2.0.0 x86 windows
get error:
compiling map_ext.c <command-line>:0:20: error: ISO C99 requires whitespace after the macro name [-W error]

[mezis]

Hi @grisevg, I'm afraid I don't have access to a Windows machine. If you manage to fix it, please open a PR or share your changes?

[stellarpower]

Can confirm I have the same, Ruby 2.2.5p319.

[mezis]

@stellarpower: if you're able to fix it, I'll happily take a PR :)

[stellarpower]

I'd be glad to, but I might not have the time right now I'm afraid. I'll see later if I can have a look at it. Sorry!