the only trouble is that the tree generated unpacking and compiling libmpfr.2.2.0.tar.bz2 is not compatible with what --with-mpfr-dir expects, so that configure exits; I had to copy the mpfr include files in foo/include, the libraries in foo/lib and use --with-mpfr=../../foo .
You have to specify a --prefix option to the configure script, and install MPFR there (`make install' of course). Then, --with-mpfr will like the directory that you specified as prefix during MPFR compilation.
The solution would be to allow one to drop GMP into GCC's source code, like this
tar xvzf gcc-4.1.0.tar.gz cd gcc-4.1.0 tar xvzf ../gmp-4.1.4.tar.gz tar xvzf ../mpfr-2.2.0.tar.gz ln -sf gmp-4.1.4 gmp ln -sf mpfr-2.2.0 mpfr mkdir build cd build ../configure Paolo
