Greetings! The GCL team is happy to announce the release of version 2.6.6, the latest achievement in the 'stable' (as opposed to 'development') series. Please see http://www.gnu.org/software/gcl for downloading information.
This release is a minor modification of 2.6.5, incorporating the known bug fixes that had accumulated on the GCL errata page together with a few other fixes required for building axiom on Windows. From the changelog:

For the latest information, capabilities, and status of GCL stable, please see the 2.6.2 release notes here