[MacPorts] #58617: ffmpeg @4.1.3: opportunistic linking to /opt/local/lib/libXv.1.dylib

[MacPorts]

#58617: ffmpeg @4.1.3: opportunistic linking to /opt/local/lib/libXv.1.dylib
--------------------+--------------------
 Reporter:  p-bro   |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  ffmpeg
--------------------+--------------------
 ffmpeg @4.1.3 +gpl2+gpl3+nonfree+x11 will opportunistically link to
 /opt/local/lib/libXv.1.dylib (provided by xorg-libXv), even though this
 package is not on the library dependencies list. A later removal of this
 package breaks the ffmpeg installation.

 Steps to reproduce:

 * Install xorg-libXv.
 * Install ffmpeg  +gpl2+gpl3+nonfree+x11
 * Uninstall xorg-libXv. Note that there is no warning that ffmpeg requires
 the presence of xorg-libXv.
 * port notices broken package.

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Ticket URL: <https://trac.macports.org/ticket/58617>
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