[MacPorts] #39956: SL.10.6.8 ghostscript "error: /include: not a directory", but: /opt/local/include has many .h files

[MacPorts]

#39956: SL.10.6.8 ghostscript "error: /include: not a directory", but:
/opt/local/include has many .h files
--------------------------+------------------------
  Reporter:  rmt1@…       |      Owner:  takanori@…
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.2.0
Resolution:               |   Keywords:
      Port:  ghostscript  |
--------------------------+------------------------

Comment (by rmt1@…):

 {{{
 Did mkdir include under /.

 sudo port install ghostscript
 --->  Computing dependencies for ghostscript
 --->  Building ghostscript
 --->  Staging ghostscript into destroot
 --->  Installing ghostscript @9.06_3
 --->  Activating ghostscript @9.06_3
 --->  Cleaning ghostscript
 --->  Updating database of binaries: 100.0%
 --->  Scanning binaries for linking errors: 100.0%
 --->  No broken files found.
 $

 I gather this is a permissions issue where a script cannot automatically
 create directories under / ?
 Thank you for the clue about absolute paths.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/39956#comment:9>
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