doesn't build on FreeBSD 10.3-RELEASE

[kevingnet]

Trying to build on FreeBSD 10.3-RELEASE gives:
var/src/grub2-bhyve-master # make
make: "/var/src/grub2-bhyve-master/Makefile" line 20789: Need an operator
make: Fatal errors encountered -- cannot continue
make: stopped in /var/src/grub2-bhyve-master

:/var/src/grub2-bhyve-master # find /usr/ -name unexport

:/var/src/grub2-bhyve-master # unexport

unexport: Command not found.

[grehan-freebsd]

You have to use gmake (make is FreeBSD make which has a different syntax).