[FFmpeg-trac] #4197(build system:new): libspeex detection is broken on systems without pkg-config

[FFmpeg]

#4197: libspeex detection is broken on systems without pkg-config
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             Reporter:  cehoyos      |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  important    |                Component:  build
              Version:  git-master   |  system
             Keywords:  libspeex     |               Resolution:
  regression                         |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by gajjanag):

 @cehoyos: you rightly point out the inconsistency.

 I think what we need to do is make FFmpeg take a clear stance on this
 issue among some options:
 1. We support pkg-config: in this case, we support it all the way, and add
 all required configure checks. I think very few people like this. I
 certainly don't.

 2. We don't support pkg-config: in this case we remove all pkg-config
 checks, and add relevant documentation in visible places saying that pkg-
 config is a build dependency. I personally don't mind this. However, I
 vaguely recall some legitimate reasons for supporting builds without pkg-
 config.

 3. We support pkg-config with some libraries and not with others: I
 consider this the most half baked option, but that is what we have
 currently. In this case, documentation must be in place for describing
 which external libs can be used without pkg-config, and which ones can't.
 This is annoying.

 BTW, in order to call it a regression, there should be proof that FFmpeg
 did support building without pkg-config at one point - I am not counting
 behavior in practice, but documentation. FFmpeg clearly delineates build
 platforms, I see no reason for why build tools (e.g pkg-config) should be
 different.
 In the absence of such proof, one can't call this a regression in my view.
 Otherwise, theoretically any change in undocumented behavior/state
 modifications can be called a "regression".

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Ticket URL: <https://trac.ffmpeg.org/ticket/4197#comment:27>
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