Port License Changes Depending on Options

[Reed A. Cartwright]

I have submitted a patch to add a port: biology/bcftools.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199747

The port is dual licensed (MIT/GPL); however,  If it is compiled with
option GPL, then some features are enabled with require it to be
licensed under GPL.

I've solved this by choosing to change the license if GPL is enabled:

LICENSE= MIT
[snip...]
.if ${PORT_OPTIONS:MGPL}
MAKE_ENV+= USE_GPL=1
LICENSE= GPLv3
.endif

However, I am not sure if this is the accepted way to specify the
license in this case.  Does anyone have any other opinion?

-- 
Reed A. Cartwright, PhD
Barrett Honors Faculty
Assistant Professor of Genomics, Evolution, and Bioinformatics
School of Life Sciences
Center for Evolutionary Medicine and Informatics
The Biodesign Institute
Arizona State University
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