loose dependency

[Hiroki Sato]

Koichiro Iwao <meta at FreeBSD.org> wrote
  in <20190314031726.aaspgwdcuithhgnc at icepick.vmeta.jp>:

me> Hi,
me>
me> If a port have runtime dependency on bin/convert command of ImageMagick
me> but whichever ImageMagick{6,7}{,-nox11} are OK, how port Makefile should
me> be written?
me>
me> ImageMagick6 and 7 conflicts each other. I want to respect user's
me> choice which ImageMagick to use.

 There is no easy solution to solve it completely because currently
 package dependency is solved in a strict manner including package
 names and version numbers, not only existence of specific files.
 Creating multiple ports which depend on each software or using
 FLAVORS to make it easier is a way to provide packages with every
 possible combinations of dependency and let one to choose.

-- Hiroki
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