This license is Free and GPL (v2 and v3) compatible. The attribution requirement here is GPLv2-compatible, based on the precedent of the NCSA/U of Illinois Open Source License.
This license was found in the "glulxe" software component, as included with "gargoyle". The copy below was taken from the source code on 2011-06-03.
The source code in this package is copyright 1999-2010 by Andrew Plotkin. You may copy and distribute it freely, by any means and under any conditions, as long as the code and documentation is not changed. You may also incorporate this code into your own program and distribute that, or modify this code and use and distribute the modified version, as long as you retain a notice in your program or documentation which mentions my name and the URL shown above.