SG3d compilation problems

I'm trying to compile SG3d on a S.G. IRIS Indigo. A problem after I
type gmake4.1 occurs.

It says that gl_winat is undefined. I can't seem to find it anywhere.

What is gl_winat? Have any of you experienced the same problem?

Cristian Santesteban
Applied Research Labs
cjs@ccwf.cc.utexas.edu