When trying to "build.sh distribution" I get this failure:
dvi.cpp:(.text+0xd6): undefined reference to `groff_optarg'
dvi.cpp:(.text+0xf5): undefined reference to `groff_optarg'
dvi.cpp:(.text+0x10e): undefined reference to `groff_optarg'
dvi.cpp:(.text+0x166): undefined reference to `groff_optarg'
dvi.cpp:(.text+0x1fe): undefined reference to `groff_getopt_long'
dvi.cpp:(.text+0x20f): undefined reference to `groff_optind'

*** Failed target:  grodvi
*** Failed command: /usr/src/obj/tooldir.NetBSD-4.99.15-i386/bin/i386--netbsdelf-gcc -Wl,-nostdlib -o grodvi -Wl,-rpath-link,/usr/src/obj/destdir.i386/lib:/usr/src/obj/destdir.i386/usr/lib -L/usr/src/obj/destdir.i386/lib -B/usr/src/obj/destdir.i386/usr/lib/ -B/usr/src/obj/destdir.i386/usr/lib/ dvi.o /usr/src/gnu/usr.bin/groff/src/libs/libdriver/obj/libdriver.a /usr/src/gnu/usr.bin/groff/src/libs/libgroff/obj/libgroff.a -lm -lsupc++ -L/usr/src/obj/destdir.i386/usr/lib -L/usr/src/obj/destdir.i386/usr/lib
*** Error code 1

Any ideas about how to fix this? :)