As a maintainer of Japanese/gawk, I tested both Japanese/gawk and lang/gawk.
Neither of ports had problems you described.
> Today I tried to 'make install' in /usr/ports/lang/gawk but failed.
> At the same time 'make build' works properly.
> Seems gawk needs gmake to install itself.
> Here is the patch for ports/lang/Makefile.
> but failed since domain klemm.gtn.com does not exsist.