/usr/ is in libsignon-glib-dev 1.13+16.04.20151209.1-0ubuntu1.
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..
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/libsignon-glib.pc
/usr/share/
/usr/share/gir-1.0/
/usr/share/gir-1.0/Signon-1.0.gir
/usr/share/vala/
/usr/share/vala/vapi/
/usr/share/vala/vapi/signon.vapi
/usr/share/doc/
/usr/share/doc/libsignon-glib-dev/
/usr/share/doc/libsignon-glib-dev/copyright
/usr/include/
/usr/include/libsignon-glib/
/usr/include/libsignon-glib/signon-identity-info.h
/usr/include/libsignon-glib/signon-identity.h
/usr/include/libsignon-glib/signon-errors.h
/usr/include/libsignon-glib/signon-enum-types.h
/usr/include/libsignon-glib/signon-types.h
/usr/include/libsignon-glib/signon-auth-session.h
/usr/include/libsignon-glib/signon-glib.h
/usr/include/libsignon-glib/signon-auth-service.h
/usr/lib/x86_64-linux-gnu/libsignon-glib.so
/usr/share/doc/libsignon-glib-dev/changelog.Debian.gz