I have downloaded ' Irrlicht SDK 1.7.2 ' ' to use it on my mac, but when I click ' Build and Run' and after it's done, it can't find the the app. Irrlicht is not an app, it's a library. The SDK also contains a few tutorials and if you compile them, you will get some demo apps. In Xcode, there are multiple targets to choose from. If you select libIrrlicht.a, only the library is built, so 'build and run' doesn't make sense (there is nothing to run). If you compile the tutorials by selecting them one by one as targets, then 'build and run' will start the selected app.
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But if you choose the target All, which I suppose you did, then the demo apps are built but you have to run them manually (out of Xcode) or tell Xcode which executable to run for the All target. A word of warning, I doubt that the examples from the 1.7.2 SDK will run smoothly out of the box on your Mac, you will probably have to tweak them a little bit (to use the OpenGL device).