When running Maven builds, there are typically a few settings that are useful to have in your ~/.bash_profile (for Mac or similar, depending on your shell) to help get things off on the right foot.
Set memory usage to 1024M minimum.
Set the path to the appropriate SDK for Flash Builder
FLASH4_SDK=’/Applications/Adobe Flash Builder 4 Plug-in/sdks/3.5.0′
Set the path for ADL if building AIR applications
Set the path to the Flash Player for launching FlexUnit tests
FLASH_PLAYER_PATH=’/Applications/Adobe Flash Builder 4 Plug-in/Player/mac/Flash Player.app/Contents/MacOS’
Append these to the current path