So I just downloaded `mingw-w64-bin_i686-mingw_20110410.zip` from [here](http://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win64/Automated%20Builds/) (GCC 4.7 apparently), and discovered it had a very recent version of the GCJ compiler.

I tried using it, but apparently *gcj* requires *ecj1.exe*, which is the Eclipse compiler for Java... so, where do I find a compatible version of the binaries of ECJ and the associated Java libraries that are needed (libgcj, etc.)?

Ideally this would be found on the MinGW-w64 project page, but it doesn't seem to exist.

(I've already tried copying them from a slightly older GCC version; **it doesn't work**.)