[FFmpeg-devel] [patch] do not run ldconfig for DESTDIR installs

[Mike Frysinger]

running ldconfig when not installing into system paths can waste
significant cpu and i/o time.  DESTDIR is generally used in two
scenarios:
 - package maintainers installing into an empty tree for packaging
 - cross-compilers installing into a development tree
in neither of these scenarios does running ldconfig make sense nor is
it useful.  the paths the libraries get installed into are rarely (ive
never heard of a case) declared in the ldso's configuration file, so
running ldconfig doesnt actually accomplish the intended goal: getting
the newly installed ffmpeg libs into the cache and symlinks created.
-mike
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