While most of us already know how the subject rings true, I still found the following from REBOL's CTO's public blog post interesting nonetheless (I've never used REBOL):
"This was an interesting build, because it exposed a unique bug due to the more secure methods of memory allocation on OpenBSD. Debugging it took some time but was worth the effort. The bug has now been fixed and will be part of the A100 releases for all platforms." The minor blog post is available at http://www.rebol.net/r3blogs/0321.html.