An earlier bug about this was closed but the problem still exists. The wdel.1 and wput.1 files aren't installed.
Makefile does this:
install -m0644 doc/wput.1.gz $(mandir)
install -m0644 doc/wdel.1.gz $(mandir)
Not all systems use .1.gz files, the .1 files should be installed. It's only 8KB extra total to do this.
Per the other bug I filed, it should be done using $(INSTALL) as well.