I'm starting a project that requires an external shared library third-party.so.

I've placed it in /usr/lib. However, when I run sudo ldconfig -v, it's not listed.

ldconfig -p | grep third-party.so proves that it wasn't added to the cache.

Does this mean that there is something wrong with the library? Or am I missing some detail? I've run readelf on it, and it didn't detect any surprises. Running file /usr/lib/third-party.so returns:

/usr/lib/third-party.so: ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, stripped

  • -v should work. It is possible as the manual states that the library has not sufficient information to be processed automatically. Jan 5, 2019 at 21:11
  • 1
    I've run sudo ldconfig -v 2>&1 | grep third-party and the library isn't processed at all.
    – user44168
    Jan 5, 2019 at 21:17
  • Would you please add a file yourlib.so output to your question? Jan 6, 2019 at 0:03
  • @RuiFRibeiro: ok, posted it.
    – user44168
    Jan 6, 2019 at 9:36

1 Answer 1


An older colleague of mine took a look and gave the solution: the .so must have a lib prefix:


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