I want to undefine a variable from a Makefile via passing a command to make. Is this possible? Man make didn't help that much.

What I want to do the following:

I want to compile a port with FreeBSD. This port is marked as broken. Though I don't have the permissions to change the Makefile I am looking for possibility to undefine the broken? variable.

Edit: In the Makefile is:

BROKEN=                 does not link

And I want to unset/undefine broken. Because the Makefile is not executed further. This is not related to compiler flags so far.

command-line makefile
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