[MacPorts] #64212: ffmpeg @4.4.1_1+gpl2: ERROR: zvbi-0.2 not found using pkg-config

[MacPorts]

#64212: ffmpeg @4.4.1_1+gpl2: ERROR: zvbi-0.2 not found using pkg-config
-------------------------+---------------------
  Reporter:  evanmiller  |      Owner:  mascguy
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.1
Resolution:  fixed       |   Keywords:
      Port:  ffmpeg      |
-------------------------+---------------------

Comment (by barracuda156):

 Replying to [comment:17 mouse07410]:
 > > rust and haskell are hard to drive.
 >
 > My point was that for installations that use apps other than what OS and
 Macports provide, modifying the system-wide rpath could be problematic.
 >
 > > They don't of course actually require the system libiconv
 >
 > If you want to rebuild everything from the source yourself, sure.
 Otherwise:
 > {{{
 >       /usr/lib/libiconv.2.dylib (compatibility version 7.0.0, current
 version 7.0.0)
 > }}}

 Any idea where exactly this is hard-coded? I have a problem now installing
 `ghc` 7.0.4 (pre-built) on Tiger due to an old `libiconv`:
 https://github.com/macports/macports-ports/pull/14674

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Ticket URL: <https://trac.macports.org/ticket/64212#comment:22>
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