gcc-3.1 issues warnings when specifying standard includes on the
cmd-line; e.g:

| $ gcc -I /usr/include -E -
| cpp0: warning: changing search order for system directory "/usr/include"
| cpp0: warning:   as it has already been specified as a non-system directory

Unfortunately, a *lot* of Hampton Beta 1 packages are setting such
directives in their *-config scripts:

| $ pkg-config oaf --cflags
|  -I/usr/include -I/usr/include/glib-1.2 -I/usr/lib/glib/include -I/usr/include/orbit-1.0  
   ~~~~~~~~~~~~~~

As you can imagine, this will break -Werror builds (e.g. used while
developing own projects). Since there are good reasons to warn about
such bad '-I...', the affected packages must be fixed.

I will use this report as a reference-point for bugs regarding this
issue.