[MacPorts] #54420: yarn @ 0.24.6: Don't install node6 if 'node' already installed by other means

[MacPorts]

#54420: yarn @ 0.24.6: Don't install node6 if 'node' already installed by other
means
--------------------------+------------------------
  Reporter:  mattbishop   |      Owner:  jambonrose
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  yarn         |
--------------------------+------------------------

Comment (by mf2k):

 If you are asking for the port to use a version of node installed outside
 of Macports, then we [wiki:FAQ#ownlibs  do not support that].

--
Ticket URL: <https://trac.macports.org/ticket/54420#comment:2>
MacPorts <https://www.macports.org/>
Ports system for macOS