how to compile the source code Bonita-engine to develop new components?

I’m new and
I downloaded the source code Bonita-Engine 6.3.8 (linux) from github may compile it into an IDE such as Eclipse?

See the documentation at:

http://documentation.bonitasoft.com/building-bonita-bpm-source-files

regards

Use the Build Script:
http://community.bonitasoft.com/project/build-script-bonita-bpm

thanks
One more question
which is the interface module of Bonita studio?

No idea, sorry.

Is there a new script for 6.4.x or is it ok to just change the numbers? 6.3.8 to 6.4.2 for example…

thanks

If you have a doubt, you can check the version needed in the pom.xml in each github repo. Versions of some connectors might have been updated, and you will have to add bonita-portal-js (introduced with 6.4.x).

By the way, we should release 6.5.0 soon, and I will update the building script for it.

Many thanks
regards
Seán