[FFmpeg-trac] #4517(build system:new): --enable-frei0r and --enable-ladspa do not fail if dlopen is missing

[FFmpeg]

#4517: --enable-frei0r and --enable-ladspa do not fail if dlopen is missing
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  minor      |              Component:  build
                Version:  git-       |  system
  master                             |               Keywords:  frei0r
             Blocked By:             |  ladspa
Reproduced by developer:  0          |               Blocking:
                                     |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 http://thread.gmane.org/gmane.comp.video.ffmpeg.user/56567/focus=56569
 If I remove dlopen from my system, the following configure line does not
 fail but frei0r and ladspa will not be enabled:
 {{{
 $ configure --enable-gpl --enable-frei0r --enable-ladspa
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/4517>
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