Simple android application from scratch tutorial won't build; missing dx.jar

I'm running IntelliJ IDEA 11.1.1 on MacOS 10.5.8.
I'm new to IntelliJ, trying to build the very basic "Simple Android Application from Scratch" tutorial at

My computer has Android SDK 2.1 installed, which I specify for my project. However when I try to build I get this error:

     File /Users/oreilly/android-sdk-mac_86/platforms/android-2.1/tools/lib/dx.jar doesnt exist

Indeed, checking my android-sdk directory that dx.jar file does not exist. I have several SDK versions installed, and dx.jar does not appear in Android SDK 2.1 and above.
I had installed the SDKs with the SDK Manager, so I don't understand why dx.jar is missing for later SDK versions.
Can anyone help?


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