[MacPorts] #42378: Upgrade icon programming language to 9.5.1 and check for X11 existence

[MacPorts]

#42378: Upgrade icon programming language  to 9.5.1 and check for X11 existence
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  Reporter:  t.tensi@…    |      Owner:  michael.grunewald@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  icon         |
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Comment (by t.tensi@…):

 > 1. Replace the sha1 checksum with the correct sha256 checksum. sha1 and
 md5 are obsolete and should only be used if upstream provides those.

 Okay, I had just mimicked the original Portfile that had exactly those
 checksums.
 In the attached corrected Portfile there is only sha256 and rmd160.

 > 2. The following code is wrong:
 > [...]

 > I have X11 and that file does not exist for me. I have the Macports
 {{{xorg-server}}} port installed.

 I now check for the existence of several X-files as mentioned in the
 Macports guide.
 Unfortunately I have 10.4 only, so if you could kindly check that on your
 system this would be fine.

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Ticket URL: <https://trac.macports.org/ticket/42378#comment:4>
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