xcode - (MonoTouch): The Apple iPhone SDK is not installed -

I would like to create Iphone applications using C # / .net

Mono development application for Monochowech application, I get the following error:

Apple iPhone SDK is not installed.

By mistake, I may have installed the software in order that there is no way to fix my installation for Monochoch?

Here are my system details:

Mac OS X Edition: 10.5.8

Processor: 2.8 GHz Intel Core 2 Duo

Downloaded and installed:

XCode 3.1.3 Mono 2.6.7 (Intel) Mono Developer 2.4.2 Mono Touch (eval 3-1.2.6)

If I installed If my IDE is not messed up and the solution is not being created then can I decide to set up anyway?

I came back and installed the software mentioned above correctly

Apple iPhone SDK is not installed.

Please help me !! !!

Mono Touch (like iOS SDK) requires OSX 10.6. OSX 10.6

Xcode 3.2.6 with iOS 4.3 SDK

Mono Touch 3.2.6 ol>