Please see the Quick Start guide here:
The following tools are required to build the MobileAppTracking ANE:
Adobe AIR
Adobe Flex SDK
http://www.adobe.com/devnet/flex/flex-sdk-download.html
Android SDK
http://developer.android.com/sdk/index.html
In the /build/ folder, open the build.config file and set your system paths for flex.sdk, android.sdk and android.platformtools.
Then from /build/, run 'ant' which will create a MobileAppTrackerANE.ane file in the /dist/ folder.