[plt-scheme] make errors

From: Neil W. Van Dyke (neil at neilvandyke.org)
Date: Sat Feb 8 18:32:38 EST 2003

> XWidgets/wxgl.h:2:20: GL/glx.h: No such file or directory

You seem to be missing OpenGL headers.  If you're using XFree86 4.x,
then install your distro's X development files package(s).  If you're
using XFree86 3.x, then install the Mesa development packages.

Be sure to re-run "configure" before you build.

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