HFSDispatch: selector 00000001 not implemented

[ryandesign]

I'm using dmake (available pre-compiled as an MPW tool at http://dev.macperl.org/files/macperl_build_libs/dmake_40m2.sit.bin) and it works fine when I specify a valid target. But if I specify an invalid target or a nonexistent makefile or ask for the help (-h) or version (-V) output, it says:

% mpw dmake asdf
# dmake:  Error -- Don't know how to make `asdf'
HFSDispatch: selector 00000001 not implemented

% mpw dmake -f nope
# dmake:  Error -- File nope not found
HFSDispatch: selector 00000001 not implemented

HFSDispatch selector 00000001 would be PBOpenWD. Even though it appears not to be vital here, I thought I'd file the issue in case PBOpenWD is easy to implement.