[MacPorts] #27568: gstreamer always prints warning about check

[MacPorts]

#27568: gstreamer always prints warning about check
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 Reporter:  ryandesign@…             |       Owner:  rmstonecipher@…           
     Type:  enhancement              |      Status:  new                       
 Priority:  Normal                   |   Milestone:                            
Component:  ports                    |     Version:  1.9.2                     
 Keywords:                           |        Port:  gstreamer                 
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Comment(by ryandesign@…):

 It's simplest to check for the existence (inside ${prefix}) of a file that
 check installs. See for example how ImageMagick bails if cryptlib is
 installed (because the installation would fail).

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Ticket URL: <https://trac.macports.org/ticket/27568#comment:3>
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