If it is not, how shall we handle this, assuming /usr/local is a standard prefix which I think we should always consider?
Well, if the user is advanced enough to install packages in non-standard locations, he should also know about the LDFLAGS option for configure :
LDFLAGS linker flags, e.g. -L<lib dir> if you have libraries in a nonstandard directory <lib dir>
So I would say that this is an user bug, not a Wine bug.
Lionel