d/ruby-1.9.1p430-x8664-2.txz: Rebuilt. [note, the problem described below does not seem to affect x86_64 but the package was rebuilt anyway to keep things consistent] Forgot to do the magic dance. Thanks to Vincent Batts. The magic dance involves rebuilding ruby the exact same way until the resulting package works for this test: ruby -e 'require "dl"' Eight tries were needed to obtain a working package.
This is from the Slackware-current ChangeLog. Even building Ruby is a dynamic process!