/usr/ is in libecal1.2-dev 3.18.5-1ubuntu1.
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..
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/libecal-1.2.pc
/usr/include/
/usr/include/evolution-data-server/
/usr/include/evolution-data-server/libecal/
/usr/include/evolution-data-server/libecal/e-cal-client.h
/usr/include/evolution-data-server/libecal/e-cal-recur.h
/usr/include/evolution-data-server/libecal/e-cal-check-timezones.h
/usr/include/evolution-data-server/libecal/e-cal-types.h
/usr/include/evolution-data-server/libecal/libecal.h
/usr/include/evolution-data-server/libecal/e-timezone-cache.h
/usr/include/evolution-data-server/libecal/e-cal-time-util.h
/usr/include/evolution-data-server/libecal/e-cal-client-view.h
/usr/include/evolution-data-server/libecal/e-cal.h
/usr/include/evolution-data-server/libecal/e-cal-system-timezone.h
/usr/include/evolution-data-server/libecal/e-cal-component.h
/usr/include/evolution-data-server/libecal/e-cal-util.h
/usr/include/evolution-data-server/libecal/e-cal-enumtypes.h
/usr/include/evolution-data-server/libecal/e-cal-view.h
/usr/share/
/usr/share/doc/
/usr/share/doc/libecal1.2-dev/
/usr/share/doc/libecal1.2-dev/copyright
/usr/lib/x86_64-linux-gnu/libecal-1.2.so
/usr/share/doc/libecal1.2-dev/NEWS.gz
/usr/share/doc/libecal1.2-dev/changelog.Debian.gz
/usr/share/doc/libecal1.2-dev/TODO
/usr/share/doc/libecal1.2-dev/README