$libdir and 8.0

Short bug report:

When installing PgSQL into a non-standard location (like /opt/foo) the 
configure script decides to install all the contrib libraries and 
plpglsq into /opt/foo/lib/postgresql.  This would be fine, except that 
backend does not recognize this directory as a place to be searched for 
$libdir (perhaps it is referencing the $libdir macro instead of the 
$pkglibdir macro?).  So tools like 'createlang' fail, and loading .sql 
files that reference things like $libdir/libfoo.so also fail.

Paul