http://hopf.math.northwestern.edu/wn-2.5.0.tar.gz, This is a new (12/08) version from Doug Hardie. He says, "Starting with release 2.5.0 WN now uses the IPv6 API. It will work with both IPv4 and/or IPv6. There have been some changes to the config.h file to support this API. Ports and IP addresses can now be entered as numeric or by name. Likewise the arguments for wn and wnssl have been changed."
http://hopf.math.northwestern.edu/wn-2.4.7.tar.gz, the old "stable" version.
The wnssl-2.0 patches were produced originally by Elias Doumas. Recently they were revised and updated by Matthias Cramer. Elias's work was based on previous work of Tim Hudson for the NCSA httpd. Thanks go to all of them.