I have tracked the source, and it comes down to a few things:
1) GCC 4.3.0 is only out for two months now
2) It is probably the
first version of GCC that actually requires GMP. All the previous versions do not need it.
3) somebody filled in the data in the matrix without having exactly followed the tutorial (i.e. has installed more)
#1 is why you are the first to find out about it.
#3 is just bad, and I fixed the matrix correspondingly
#2 is the actual source of the problem, and it just looks like they added more unnecessary bloat to the compiler. (they provide
arbitrary-precision maths, but it is beyond me why they can't just substitute from the C library's math.h when that's possible)
I also wonder whether this change is going to cause trouble for people going self-hosted, as they suddenly need to provide an additional library to compile GCC...
but thanks for pointing it out
Edit: typo fixed