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?