(debian-policy.info)ldconfig

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Up: Run-time shared libraries

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8.1.1 ‘ldconfig’
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Any package installing shared libraries in one of the default library
directories of the dynamic linker (which are currently ‘/usr/lib’ and
‘/lib’) or a directory that is listed in ‘/etc/ld.so.conf’ (1) must use
‘ldconfig’ to update the shared library system.

Any such package must have the line ‘activate-noawait ldconfig’ in its
‘triggers’ control file (i.e.  ‘DEBIAN/triggers’).

   ---------- Footnotes ----------

   (1) These are currently ‘/usr/local/lib’ plus directories under
‘/lib’ and ‘/usr/lib’ matching the multiarch triplet for the system
architecture.