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If you want to avoid compatibility problems, it's important to build cross-compiler targeted for particular version of Linux.

Unlike Windows, version numbers of specific distribution of Linux (for example, Ubuntu 9 or Debian 6) are unimportant in the context of cross-compilation.

What's important then? You should note the combination of "gcc version" + "binutils version" + "glibc version" + "kernel version".

1) Version of gcc (GNU compiler collection)
To determine it, log in to the installation of target Linux version (for example, Ubuntu 9) and run the following command in the console:
$ gcc --version

Sample output:

Also running "gcc -v" may be helpful, it shows options that were passed for "configure" script when gcc was built for the target system.

2) Version and target architecture of binutils (GNU linker, assembler etc)
To determine it:
$ ld --version
$ as --version

Sample output:

Target architecture is also important to note, example above shows target architecture for GNU assember on 32-bit Ubuntu 9. GNU assembler on 64-bit Ubuntu 9 prints x64_64-linux-gnu .

3) Version of glibc (GNU libc)
To determine it:
$ ldd --version

Sample output:

4) Kernel version
To determine it:
$ uname -r

Sample output:

>> Read next section or buy already prepared cross-compiler (€10) to save your time.