How to build GCJ/GDC ?

[Игорь Пашев <pashev.igor@gmail.com>]

I'd like to make custom build of GCJ.

Here is a source package page:

http://packages.debian.org/source/sid/gcj-4.7

but the VCS URL is for GCC.

I've already built GCC and know all that package (gcc-4.7) well.

And now I wonder how to use it to build GCJ.

Should I put into root dir tarball of GCJ sources instead of GCC?