/usr/ is in libebackend1.2-dev 3.28.1-1ubuntu1.
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..
/usr/include/
/usr/include/evolution-data-server/
/usr/include/evolution-data-server/libebackend/
/usr/include/evolution-data-server/libebackend/e-backend-enums.h
/usr/include/evolution-data-server/libebackend/e-backend-enumtypes.h
/usr/include/evolution-data-server/libebackend/e-backend-factory.h
/usr/include/evolution-data-server/libebackend/e-backend.h
/usr/include/evolution-data-server/libebackend/e-cache-reaper.h
/usr/include/evolution-data-server/libebackend/e-cache.h
/usr/include/evolution-data-server/libebackend/e-collection-backend-factory.h
/usr/include/evolution-data-server/libebackend/e-collection-backend.h
/usr/include/evolution-data-server/libebackend/e-data-factory.h
/usr/include/evolution-data-server/libebackend/e-db3-utils.h
/usr/include/evolution-data-server/libebackend/e-dbhash.h
/usr/include/evolution-data-server/libebackend/e-dbus-server.h
/usr/include/evolution-data-server/libebackend/e-file-cache.h
/usr/include/evolution-data-server/libebackend/e-oauth2-support.h
/usr/include/evolution-data-server/libebackend/e-offline-listener.h
/usr/include/evolution-data-server/libebackend/e-server-side-source-credentials-provider.h
/usr/include/evolution-data-server/libebackend/e-server-side-source.h
/usr/include/evolution-data-server/libebackend/e-source-registry-server.h
/usr/include/evolution-data-server/libebackend/e-sqlite3-vfs.h
/usr/include/evolution-data-server/libebackend/e-subprocess-factory.h
/usr/include/evolution-data-server/libebackend/e-user-prompter-server-extension.h
/usr/include/evolution-data-server/libebackend/e-user-prompter-server.h
/usr/include/evolution-data-server/libebackend/e-user-prompter.h
/usr/include/evolution-data-server/libebackend/e-webdav-collection-backend.h
/usr/include/evolution-data-server/libebackend/libebackend.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/libebackend-1.2.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libebackend1.2-dev/
/usr/share/doc/libebackend1.2-dev/copyright
/usr/lib/x86_64-linux-gnu/libebackend-1.2.so
/usr/share/doc/libebackend1.2-dev/changelog.Debian.gz