If anyone is still interested in this (in 2019) ...
There are copies of achartengine on github, and the primary seems to be this:
The project has both build.xml
and pom.xml
files, so it should be possible to build it with either Ant or Maven. (I haven't tried though.)
There should be adequate instructions on how to use those tools in the Ant and Maven documentation. And instructions on how to troubleshoot build problems.
I am guessing that the Dan D who commented above in 2014 is the Dan Dromereschi who owns the github repo. (And I get the point he was making about not making private mods. Open source depends on people being community minded and contributing to the project. If you have worthwhile mods / patches, tell Dan about it.)