[MacPorts] #69445: libsigcxx2: check license situation with graphviz

[MacPorts]

#69445: libsigcxx2: check license situation with graphviz
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 Reporter:  jmroot       |      Owner:  dbevans
     Type:  enhancement  |     Status:  assigned
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  libsigcxx2
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 GPL dependents of libsigcxx2 are not distributable currently because of
 the graphviz dependency. I don't know how libsigcxx2 uses graphviz, but if
 it's only running the executable to generate documentation images or
 something like that, it could set `license_noconflict graphviz`.

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Ticket URL: <https://trac.macports.org/ticket/69445>
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