Hi,

When building gdb-6.8.91 with a simulator enabled, gdb's configuration 
issues a warning similar to this:

...
config.status: creating Make-common.sim
config.status: WARNING: 
'../../../gdb-6.8.91/sim/m32c/../common/Make-common.in' seems to ignore 
the --datarootdir setting
...

A fix to this is to add
datarootdir = @datarootdir@
to sim/common/Make-common.in

Patch enclosed below.

Ralf