As noted earlier there are some problems since 2.2.6 with the mod_ssl module in Leopard.
There seems to be some progress being made by people at apache as someone posted a comment to the original post which you might have missed. You can read the bugreport at: http://issues.apache.org/bugzilla/show_bug.cgi?id=44384
It looks like a version issue of the libtool, a new version of libtool has solved the problem. I hope it works out and I will see what I can do to help you compile it properly on your Mac running Leopard.