In gstglapi.h, Line 128 is as follows:

  ret GSTGLAPI (*name) args;

which in MSVC in Vs2013 causes the following intellisense error:

	109	IntelliSense: a calling convention may not be followed by a nested declarator	d:\SDKS\gstreamer\1.0\x86\include\gstreamer-1.0\gst\gl\glprototypes\base.h	68

As far as I can tell the issue has to do with how the compiler likes its convention of __stdcall. The MSVC way is to extend the paraentheses to include the call itself, thusly:

  ret (GSTGLAPI *name) args;

Voila. Working in MSVC. Probably needs some more #define's around it to make sure it doesn't break something in other compilers.