LispWorks Release Notes and Installation Guide
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12 Troubleshooting, Patches and Reporting Bugs
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12.4 Troubleshooting on x86/x64 Solaris
12.4.1 GTK+ version
GTK+ version 2.4 or higher is required to run the LispWorks image as distributed.
LispWorks Release Notes and Installation Guide - 21 Dec 2009