38. I get the following error while building: make[4]: don't know how to make HP-UX/nut-drvctl.sh. Stop

NUT still has some hidden dependencies on GNU Make which show up while running make distcheck. If you are running make distcheck or its variants, you will need to install GNU Make (devel/gmake in the ports tree), which is incidentally what the official FreeBSD port of NUT does for all builds.