In article 001b01bfb5d6$9db55a00$ad2f9bd4@pbn-computer, Nathalie Jarosz njarosz@fr.packardbell.org writes

Today, I manage to install patch so I go on a little with the installation but the step 2 (configuration) is not ok :

2. Configuring and building GNU CC GNU Pascal is automatically configured with GNU CC. Configuration of GNU CC is treated in depth in *Note the GCC installation instructions: (gcc)Installation. Chdir to the GCC object directory. (This can be a directory of your choice, including the GCC source directory.) From there, run the `configure' script in the GCC source directory. If both directories are the same, the command % ./configure is sufficient to configure GCC in most cases

When I do this, the following message appears : " creating cache./config.cache checking host system type ... configure : error : can not guess host type ; you must specify one"

What does it mean?

I've seen that problem. Of course I can't manage to remember the exact fix. It is because you haven't installed something or other required for building gcc. Looking at my notes I suggest you try installing the rpms (assuming you are on an rpm based version of Linux) for glibc-devel and kernel-headers. For RedHat 6.0 the files are glibc-devel- 2.1.1-6.rpm and kernel-headers-2.2.5.-15. Come back if that doesn't work and I'll scratch my head harder.