Hi

I'd like to build the recently released Ruby 1.9.1 as a universal binary 
on OS X. I'm on an Intel 10.5, but want the ruby to be runnable on 10.4 
or 10.5, Intel or PPC.

Following this tech note and advice:
http://developer.apple.com/technotes/tn2005/tn2137.html
http://lists.apple.com/archives/Xcode-users/2007/Oct/msg00686.html

I did:

Abaddon:ruby-1.9.1-p0 alex$ export CFLAGS="-O3 -g -isysroot 
/Developer/SDKs/MacOSX10.4u.sdk -arch i386 -arch ppc 
-mmacosx-version-min=10.4"
Abaddon:ruby-1.9.1-p0 alex$ export LDFLAGS="-arch i386 -arch ppc"
Abaddon:ruby-1.9.1-p0 alex$ ./configure --prefix=~/bleed

However, the resultant ruby isn't marked as universal:

Abaddon:ruby-1.9.1-p0 alex$ ~/bleed/bin/ruby -v
ruby 1.9.1p0 (2009-01-30 revision 21907) [i386-darwin9.6.0]
                                           ^^^^^^^^^^^^^^^^
Unlike the standard 10.5 install of ruby 1.8.6:

Abaddon:~ alex$ ruby -v
ruby 1.8.6 (2008-03-03 patchlevel 114) [universal-darwin9.0]
                                         ^^^^^^^^^^^^^^^^^^^
Can anyone offer any advice here please?

alex