I am trying to build gcc-4.2.1. I see in the prerequisites the following. GNU Multiple Precision Library (GMP) version 4.1 (or later) Necessary to build GCC. If you do not have it installed in your library search path, you will have to configure with the --with-gmp configure option. See also --with-gmp-lib and --with-gmp-include. MPFR Library version 2.2.1 (or later) Necessary to build GCC. It can be downloaded from http://www.mpfr.org/. The version of MPFR that is bundled with GMP 4.1.x contains numerous bugs. Although GCC may appear to function with the buggy versions of MPFR, there are a few bugs that will not be fixed when using this version. It is strongly recommended to upgrade to the recommended version of MPFR. The --with-mpfr configure option should be used if your MPFR Library is not installed in your default library search path. See also --with-mpfr-lib and --with-mpfr-include. I am using GNU/Linux redhat release 4 to do the building. I am also trying to build a gcc and all the other gnu utilities that are standalone from those provided with the operating system. The reason for this is that I also am building the same set of tools on solaris 8. The paths on each OS has to be the same for the ease of use by the users and tools. I see that the gmp and/or mpfr versions of the GNU/Linux system are older then those available on the net. I want to build the gcc using these newer versions. I have tried a number of ways to accomplish this but the bootstrap build seems to not find my newer version in the later build pass. Has someone else done this? Does anyone know how I might accomplish this? It seems like the two libraries should each be built as part of the gcc build itself. This way they are installed in the gcc include/lib directories during the process. Any help would be appreciated. Thanks Warren