jadedctrl 
I am actually kind of amazed it was so easy for me to build gmake 3.80 from 2002 for arm64.
All I needed was to use an old Linaro toolchain, copy over some files, and…
$ cd make-3.80/
$ cp /usr/share/autoconf/build-aux/config.{guess,sub} config/
$ ./configure --host=aarch64-linux-gnu
$ make
Sugoi~! 
