/usr/ is in libpolkit-agent-1-dev 0.105-15~deb8u2.
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..
/usr/share/gir-1.0/
/usr/include/
/usr/include/polkit-1/
/usr/include/polkit-1/polkitagent/
/usr/include/polkit-1/polkitagent/polkitagenttextlistener.h
/usr/include/polkit-1/polkitagent/polkitagentsession.h
/usr/include/polkit-1/polkitagent/polkitagentenumtypes.h
/usr/include/polkit-1/polkitagent/polkitagenttypes.h
/usr/include/polkit-1/polkitagent/polkitagent.h
/usr/include/polkit-1/polkitagent/polkitagentlistener.h
/usr/share/
/usr/share/gir-1.0/PolkitAgent-1.0.gir
/usr/share/doc/
/usr/share/doc/libpolkit-agent-1-dev/
/usr/share/doc/libpolkit-agent-1-dev/changelog.Debian.gz
/usr/share/doc/libpolkit-agent-1-dev/copyright
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/polkit-agent-1.pc
/usr/lib/x86_64-linux-gnu/libpolkit-agent-1.a
/usr/lib/x86_64-linux-gnu/libpolkit-agent-1.so