I haven’t done this myself yet, but I think you’ll have to hack on 
rakelib/builder/options.rb a bit to select the 10.6 SDK, or alternatively build 
the framework from source on a 10.6 machine.


On Oct 4, 2011, at 5:21 PM, Nick Ludlam wrote:

> Hi all,
> I'm building a MacRuby app on Lion, and then getting testers to run it on 
> Snow Leopard, and I'm seeing the following symbol problem:
> 
> dyld: Symbol not found: __dispatch_queue_attr_concurrent
> Referenced from 
> MyApp.app/Contents/MacOS/../Frameworks/MacRuby.framework/Versions/Current/usr/lib/libmacruby.dylib
> Expected in: flat namespace
> 
> I'm guessing this is a GCD thing.  On my system, this seems to be provided by 
> /usr/lib/libobjc.A.dylib, but is this not the case on SL installs?
> 
> I'm using MacRuby HEAD, if that has any bearing on things, but if anyone has 
> an idea as to the problem, I'd be very grateful!
> 
> 
> Nick
> 
> _______________________________________________
> MacRuby-devel mailing list
> MacRuby-devel@lists.macosforge.org
> http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel

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