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I just upgraded my machine to Lion to see if the project works on the new OS, but I else need to support users using the program on machines running OS X 10.5, but Xcode 4.1 doesn't come with the 10.5 SDK, where can I get the SDK & how do I install it on my system?

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Read this, some good info. You can install Xcode 3.2.6 on Lion it seems. – Paul Eccles Aug 2 '11 at 7:23
I thought there was an option to install the 10.5 SDK when installing Xcode, but perhaps I'm wrong... – jtbandes Aug 2 '11 at 7:24
@jtbandes there was an option to install previous SDKs when installing Xcode....that feature was dropped in Xcode 4.1 TT.TT – Samantha Catania Aug 2 '11 at 7:27

That SDK isn't "supported" by Apple on that version of Xcode. You can still try Xcode 3.2.6 on Lion to avoid keeping around Snow Leopard for the "supported" version.

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up vote 1 down vote accepted

Download the disk image of xcode 3 (latest version) & found MacOSX10.5.pkg under packages & installed it in the Developer folder, it works great for the majority of stuff (had some problems with a C++ Library but managed to work around it)

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