[MacPorts] #53166: yarn: default to an older nodejs on < 10.8

[MacPorts]

#53166: yarn: default to an older nodejs on < 10.8
------------------------------+------------------------
 Reporter:  mojca             |      Owner:  jambonrose
     Type:  defect            |     Status:  new
 Priority:  Normal            |  Milestone:
Component:  ports             |    Version:
 Keywords:  snowleopard lion  |       Port:  yarn
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 nodejs6 only seems to work on 10.8 and later (see #53165 and many other
 tickets).

 Based on comments in the portfiles it seems that nodejs4 and 5 require at
 least 10.6 and nodejs requires at least 10.7. I suspect that the build
 failure on 10.7 might be only a matter using a too old compiler on 10.7
 though and the following blacklist might not be sufficient:

 {{{
 compiler.blacklist *gcc* {clang < 300}
 }}}

 It would be nice to fallback to an older version of nodejs (perhaps
 version 5) on < 10.8 (or on < 10.7 once the issue of building nodejs6 gets
 resolved on Lion).

 Btw: is the isomarcte's email in Yarn misspelled?

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Ticket URL: <https://trac.macports.org/ticket/53166>
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