Wow, it’s been more than a year since a release of this package. Not bad.
Today’s release just fixes a problem on some Windows configurations (64-bit MinGW, at least), where <windows.h> must be included in order for autoconf to detect <GL/gl.h> as usable.
In order to streamline GtkGLExt‘s configure.ac (and to provide decent support for the coming Quartz backend), I started using the macros there. So that’s a bit more exposure and exercise they’re getting.