systemd/man/libsystemd-pkgconfig.xml

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<refsect1>
  <title>Notes</title>

  <para id='pkgconfig-text'>These APIs are implemented as a shared
  library, which can be compiled and linked to with the
  <constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
  file.</para>
</refsect1>