Was there any change recently that may have affected the handling of --with-mpfr? I have my own version of mpfr installed under ~/opt/mpfr, which I pass to --with-mpfr as always (I do the same with gmp under ~/opt/gmp). I always do this, but now, it seems that I can't use the shared libraries: /tmp/myroot/build/gcc/build64/./gcc/xgcc: error while loading shared libraries: libmpfr.so.1: cannot open shared object file: No such file or directory The file is definitely in ~/opt/mpfr/lib, but that's not being passed on to xgcc.