using test suite outside of build directory

[Jack Howarth]

   I am wondering if it is at all possible to coax the gcc 4.0
testsuite to run cleanly with a binary installation of gcc 4.0?
That is does the testsuite absolutely have to be run from within
the gcc build directory structure or can one run it standalone
(to see where a given gcc 4.0 distribution sits relative to the
current tests)?
               Jack