tar -xJf mpfr-3.1.1.tar.xz
cd mpfr-3.1.1
./configure  --prefix=/usr        \
             --enable-thread-safe \
             --docdir=/usr/share/doc/mpfr-3.1.1
make
make check
make install
make html
make install-html
cd ..
rm -fr mpfr-3.1.1