try to run
android update sdk -u
in the terminal.
You will see such magazines on the screen.
Installing Archives: Preparing to install archives Downloading Android SDK Platform-tools, revision 17 Installing Android SDK Platform-tools, revision 17 Stopping ADB server succeeded. Installed Android SDK Platform-tools, revision 1799%) Downloading Android SDK Build-tools, revision 17 Installing Android SDK Build-tools, revision 17 Installed Android SDK Build-tools, revision 1799%) Downloading ARM EABI v7a System Image, Android API 17, revision 2 (71%, 775 KiB/s, 41 seconds left))
After successfully updating the Android SDK, make sure the build tools are installed.

lucas May 23 '13 at 7:13 2013-05-23 07:13
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