text: libnice stores its headers in e.g. /usr/include/nice/ but 'pkg-config --cflags nice'
  gives '-D_REENTRANT -I/usr/include/nice' meaning a generic-named header should as agent.h, debug.h or interfaces.h is includable as:
  #include <agent.h>
  #include <debug.h>
  #include <interfaces.h>
  Moreover, the include-guard used in e.g. agent.h:
  #ifndef _AGENT_H
  #define _AGENT_H
  is overly generic as well, and risks collision with other packages.
  I couldn't agree more, but changing this would break existing apps. So it will have to wait until we do an API break of some kind.
  The include-guards can be changed already.
  Possibly, we should encourage people to use #include <nice/agent.h> instead of just <agent.h>.
  I improved the guards a little.
  commit 52534c43be1fdc74cd15f64ba28b8e753c212b62
  Author: Olivier Crête <olivier.crete@collabora.com>
  Date: Mon Apr 20 15:44:16 2015 -0400
  Prefix include guards
  The include file names are very generic, at least make
  the guards a bit less generic.
  Migrated to Phabricator:
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