building a port with very long list of build options

[Carl]

Let's say I want to build a port for which I need to specify a huge 
number of build options (eg. ghostscript). In my case I am 
cross-compiling on an amd64 host for what will be a NanoBSD i386 target, 
but I don't think that's important here. The scenario precludes using 
the familiar configuration menu. The problem is that the desired list of 
options far exceeds what would be sane to specify on the 'make' command 
line. In fact, it apparently even exceeds what typical text editors 
tolerate when trying to enter the line in a shell script. What is the 
recommended solution?

Given that I do not want to customize the port's Makefile, I was hoping 
'make' would support a command line option that would let me simply 
point to a separate file containing the list of variables to add, one 
per line. It's not apparent to me that that exists.

Carl                                             / K0802647