Having looked at it a bit more, I see other statically linked ports with empty WANTLIB (e.g. shells/tcsh), but that doesn't necessarily mean it's correct. Since I don't know, here's another tgz identical to the last but with WANTLIB=c (which, if you remove -static, is what it would require).
scdoc-wantlib.tgz
Description: GNU Zip compressed data
