Here I describe how I compiled and installed gcc supporting C, C++ and Fortran languages on an Alpha machine (HP TestDrive System). What you see here is what I tried and worked, but there is no guarantee that these instructions work for you too!

• I tried to install gcc in my own home directory, because I didn't have root access. If you have root access, you may not want to use "--prefix=..." to configure the packages.
• If you have already installed another version of gcc, remove it from your path so that the scripts do not use it and use the one that comes with Tru64 OS. Besides don't try to install gcc in the same directory and pick a new directory for this purpose.
• I was using bash.

Before starting to download and install gcc, you need GMP and MPFR if you want to enable Fortran language.
If you don't need Fortran, you can skip the installation of GMP and MPFR.

1. Download GMP from http://www.swox.com/gmp/
2. copy the file to /tmp and uncompress it there. Let's assume that the extracted files are in /tmp/gmp-4.2.1
3. cd /tmp/gmp-4.2.1
4. ./configure --prefix=$HOME/progs/gmp
5. make
6. make check
   Check the messages and make sure that no test failed.
7. make install

1. Download MPFR from http://www.mpfr.org/mpfr-current/
2. copy the file to /tmp and uncompress it there. Let's assume that the extracted files are in /tmp/mpfr-2.2.0
3. Check the website for any available patches and apply them if there is any

Note: Use /usr/local/bin/patch to apply any existing patch.

4. cd /tmp/mpfr-2-2.0
5. LD_LIBRARY_PATH=$HOME/progs/gmp/lib:$LD_LIBRARY_PATH ./configure --prefix=$HOME/progs/mpfr --with-gmp=$HOME/progs/gmp
6. gmake
7. gmake check
8. gmake install

1. Download libiconv from http://www.gnu.org/software/libiconv/
2. copy the file to /tmp and uncompress it there. Let's assume that the extracted files are in /tmp/libiconv
3. cd /tmp/libiconv
4. ./configure --prefix=$HOME/progs/libiconv
5. make
6. make install

1. Download gcc from http://gcc.gnu.org
2. Uncompress the file under a directory in /tmp. Let's assume that the extracted files are in /tmp/gcc-4.1.1/

Note: You should use gtar to untar the file, otherwise you will get some errors similar to this:
tar: ././@LongLink : Unknown filetype

3. Create another directory in /tmp. Let's call this directory gcc-build

Note: If you are using HP TestDrive systems, it is important to use /tmp, because you don't have enough disk quota in your home directory to compile gcc.

4. cd /tmp/gcc-build
5. CC="gcc -Wa,-oldas" /tmp/gcc-4.1.1/configure --prefix=$HOME/gcc --enable-languages=c,c++,fortran --with-gmp=$HOME/progs/gmp --with-mpfr=$HOME/progs/mpfr --with-libiconv-prefix=$HOME/progs/libiconv

If you don't need C++, omit it from --enable-languages. C++ takes a relatively large amount of disk space.

If you don't need Fortran, use this command instead:
CC="gcc -Wa,-oldas" /tmp/gcc-4.1.1/configure --prefix=$HOME/gcc --enable-languages=c,c++ --with-libiconv-prefix=$HOME/progs/libiconv

6. LD_LIBRARY_PATH=$HOME/progs/gmp/lib:$LD_LIBRARY_PATH gmake bootstrap-lean

Note: You should use GNU make (gmake) version 3.80 or higher to build gcc.
This step takes a long time, usually a few hours!

If you don't want to install Fortran simply use:
gmake bootstrap-lean

7. gmake install

If tar complains that it failed to preserve ownership of files, you'll need to change the ownership of /tmp/gcc-build.
Go to your home directory and run ls -l. In my case the problem was from group name. The group name of all the files in my home directory was nis while the group name of /tmp/gcc-build and all the files under the directory was system.
So, I ran chown -hR MyUsername:nis /tmp/gcc-build then I removed $HOME/gcc and ran gmake install again.

Now it is time to remove the folders and files that you have created in /tmp. In our example: /tmp/gcc-4.1.1, /tmp/gcc-build, /tmp/libiconv, /tmp/mpfr-2.2.0, /tmp/gmp-4.2.1