ARB will compile with several versions of gcc.

The main Makefile in the ARB directory lists all supported versions
and complains if you try to use an untested gcc version.
See http://bugs.arb-home.de/wiki/GccVersionInfo for up-to-date
information about supported and refused gcc version.

You may try to simply add the untested version number to the Makefile
and try compilation. Especially if the version lays somewhere inbetween
the listed versions your chances are good that it will work.

If you encounter compilation problems with any of the versions listed
in the Makefile, please report to devel@arb-home.de

If your gcc version refuses to compile ARB, you need to install an
additional gcc.