[MacPorts] #42188: Dependency error in ffmpeg 2.1.3_1 on libogg 1.3.1_0

[MacPorts]

#42188: Dependency error in ffmpeg 2.1.3_1 on libogg 1.3.1_0
----------------------+----------------------
  Reporter:  me@…     |      Owner:  devans@…
      Type:  defect   |     Status:  closed
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.2.1
Resolution:  invalid  |   Keywords:
      Port:  ffmpeg   |
----------------------+----------------------

Comment (by larryv@…):

 Replying to [comment:15 me@…]:
 > Apple's dyld is giving a misleading error message (failing to
 > distinguish the dylib id - the same string as a file path - from an
 > actual file path), which is a bug.

 It’s arguably intended behavior and thus would not be considered a bug.
 Confusing, but not a bug. Again, if the dylib ID is a complete file path
 that does not correspond to the actual library path or contain a special
 dyld variable like `@rpath`, then the library is //broken//.

 And there happens to be an environment variable that prods `dyld` into
 exhibiting the behavior you’re expecting:
 {{{
 DYLD_PRINT_LIBRARIES
        When this is set, the dynamic linker writes to file descriptor 2
        (normally  standard  error)  the  filenames of the libraries the
        program is using.  This is useful to make sure that the  use  of
        DYLD_LIBRARY_PATH is getting what you want.
 }}}

 In any case, this is irrelevant because most of us don’t work at Apple and
 can’t change `dyld`.

 > > MacPorts is not invoked in any way when you use a port; it only
 > > manages dependencies and installation.
 >
 > And when it does so, it could warn you that your configuration is
 > broken so ports it installs can't be expected to work.  When it scans
 > for linking errors it could check against DYLD_LIBRARY_PATH

 No, it couldn’t. `DYLD_*` variables are scrubbed from MacPorts’
 environment by `sudo(8)` as a security measure.

-- 
Ticket URL: <https://trac.macports.org/ticket/42188#comment:16>
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