order of multiple PKGNAMEPREFIX?

[Koichiro Iwao]

Hi, 

I have a question when a port has multiple PKGNAMEPREFIX. I'm still not
sure after reading porter's handbook[1]. If prefixed ports such as p5-,
py-, rubygem- are under language or region category, which prefix should
appear earlier?

As well as other existing ports, I believe language_region- should
appear earlier. Am I correct?

See also: https://reviews.freebsd.org/D16002

[1] https://www.freebsd.org/doc/en/books/porters-handbook/makefile-naming.html

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