Now that eclipse 4.5 is out and the eclipse team decided to not build the so-called \"delta-pack\" anymore, I don\'tknow how to perform a PDE headless build with ant..
Deltapack is removed from 4.5.1 officially as per the below bug.
https://bugs.eclipse.org/bugs/show_bug.cgi?id=480149
You can build multi-platform builds using the following wiki.
https://wiki.eclipse.org/Building#Multi-platform_build