[MacPorts] #70137: gtk4: "No provider of glGenSamplers found" error on older systems

[MacPorts]

#70137: gtk4: "No provider of glGenSamplers found" error on older systems
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  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.9.3
Resolution:                |   Keywords:
      Port:  gtk4          |
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Comment (by mohd-akram):

 They seem to be trying to fix it, they haven't closed the issue at least.

 > A perspective of having to add per-port pegs to GTK3 is really
 unappealing, especially given that I will need to do that LOL

 This can probably be fixed in GTK 4 itself. Per-port pegs are unnecessary
 when it builds fine and there's a simple workaround.

 > we need to issue a warning to users to use an env variable.

 Can probably be added to the notes.

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Ticket URL: <https://trac.macports.org/ticket/70137#comment:6>
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