[MacPorts] #67243: gtk3: gtk-encode-symbolic-svg hangs with adwaita-icon-theme on MacOS

[MacPorts]

#67243: gtk3: gtk-encode-symbolic-svg hangs with adwaita-icon-theme on MacOS
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  Reporter:  lukaso                   |      Owner:  mascguy
      Type:  defect                   |     Status:  assigned
  Priority:  Normal                   |  Milestone:
 Component:  ports                    |    Version:  2.8.1
Resolution:                           |   Keywords:
      Port:  gtk3 adwaita-icon-theme  |
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Comment (by ryandesign):

 I'm not sure, but it looks like they try to spawn a bazillion simultaneous
 `install-sh` commands, then `wait` for them all to finish, then do it
 again. It's certainly possible that there is a bug in macOS such that it
 can't handle spawning a lot of simultaneous processes. We've seen that
 before with the way that MacPorts base spawns `ping` processes to find
 which servers are closest to you; see #61683.

 Try rewriting the Makefile so that it does things sequentially (remove the
 `&` at the end of each `install-sh`; you can remove the `wait` too but it
 wouldn't matter if you left it in since there wouldn't be any background
 processes to wait for).

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Ticket URL: <https://trac.macports.org/ticket/67243#comment:4>
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