gccare not sufficiently similar.
Thinking about this, I believe I've seen the phrase 'binary incompatibility' bandied about, and I think this may have something to do with it (did I mention that I don't really understand C compilers?)
So I've just downloaded the ActiveState sources
which I'm going to attempt to build.
This is all turning out to be much harder than
my normal method of installing software onto a
Windows PC (double-click on
setup.exe, then watch the pretty display flash
by...) Wish me luck.