bad classpath with ant build/test when includeantruntime='true' #710
Description
Some tasks using javac, e.g. compile-jruby have includeantruntime="true".
This cause build/test errors in some packaging systems, e.g. pacman for Arch Linux, because the apache-ant package ships with all the optional libraries, including a quite outdated jruby.jar (0.9.8 at the time of writing this).
I think the solution should be to change includeantruntime to false, then explicitly include only necessary libraries/jars from Ant.
We need yet to figure out what are the 'necessary jars we need from ant'.