[MacPorts] #61943: libsdl2 @2.0.14 +x11: Doesn't work properly without upstream XQuartz.app installed/with only MacPorts' `xorg-server`

[MacPorts]

#61943: libsdl2 @2.0.14 +x11: Doesn't work properly without upstream XQuartz.app
installed/with only MacPorts' `xorg-server`
----------------------+----------------------
  Reporter:  larb0b   |      Owner:  jmroot
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.6.4
Resolution:           |   Keywords:  haspatch
      Port:  libsdl2  |
----------------------+----------------------
Changes (by larb0b):

 * Attachment "Portfile-libsdl2.2.diff" added.

 Patch that adds mesa as a dependency when building the X11 variant + finds
 and replaces /opt/X11 with your prefix in SDL_x11opengl.c

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Ticket URL: <https://trac.macports.org/ticket/61943>
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