I am having Xcode 4.4 on OS X Lion. I\'d like to install the Mac 10.6 SDK - also known as macosx10.7 SDK - because I need to compile openFrameworks.
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Some SDK(with Xcode) you can download from direct links. List here: http://iphonesdkdev.blogspot.ru/2010/04/old-versions-of-iphone-sdk.html
Some don't work, but something you can still download. For example: http://adcdownload.apple.com/Developer_Tools/xcode_3.2.6_and_ios_sdk_4.3__final/xcode_3.2.6_and_ios_sdk_4.3.dmg