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

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