OK, the nightly builds have been updated. Please try the build scripts. If you already have the flex-asjs repo, make sure you have the pre-requisites described here [1] then pull the latest changes and run ‘ant all’.
If you don’t have the repos and have installed the flexjs nightly, also make sure you have the pre-requisites [1], then in the folder where you installed the nightly, run ‘ant’. -Alex [1] https://cwiki.apache.org/confluence/display/FLEX/FlexJS+Developer+Setup