Note the difference, that it is omitting the version numbers.
Reason is easy. The moment I update the version in AOLserver I have to change my config.tcl file, as it relies on the filename being correct (e.g. /lib/thread2.6.4/libthread2.6.4.so) for loading the package. And I want to have a general statement trying to load whatever libthread package there is in OpenACS config.tcl