ports/158827: devel/rubygem-rdoc: fix compatibility with ruby 1.8

[Frank Wall]

On Wed, 13 Jul 2011 14:57:34 +0200, Frank Wall wrote:
> Well, that's true. My mistake, I've only changed that line to "1.8"
> and this really broke it. By simply removing the line it works like a 
> charm.

Unfortunately, my tinderbox told me that the problem still exists.
Though you can workaround it by calling `make install` twice. I
guess this is why it did work for me on the second try.

Take a look at the log:
http://pastebin.com/jbcei4yq

This takes me to the conclusion that we're still running into
this kind of bootstrap problem that the NetBSD people also
needed to fix for rdoc 3.6:
http://permalink.gmane.org/gmane.os.netbsd.devel.pkgsrc.cvs/157474

$ uname -a
FreeBSD 7.3-RELEASE-p2 FreeBSD 7.3-RELEASE-p2 #0: Mon Jul 12 19:23:19 
UTC 2010     
root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64
$ pkg_info -xI ruby
ruby+nopthreads-1.8.7.302,1 An object-oriented interpreted scripting 
language
ruby18-bdb-0.6.6    Ruby interface to Sleepycat's Berkeley DB revision 
2 or lat
ruby18-gems-1.7.2   Package management framework for the Ruby language
rubygem-rdoc-3.6    RDoc produces HTML and command-line documentation 
for Ruby


Thanks
- Frank