/usr/ is in libkf5messagecore-dev 4:16.04.3-3~deb9u1.
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..
/usr/share/doc/libkf5messagecore-dev/
/usr/include/
/usr/include/KF5/
/usr/include/KF5/MessageCore/
/usr/include/KF5/MessageCore/AttachmentCompressJob
/usr/include/KF5/MessageCore/AttachmentFromFolderJob
/usr/include/KF5/MessageCore/AttachmentFromMimeContentJob
/usr/include/KF5/MessageCore/AttachmentFromUrlBaseJob
/usr/include/KF5/MessageCore/AttachmentFromUrlJob
/usr/include/KF5/MessageCore/AttachmentFromUrlUtils
/usr/include/KF5/MessageCore/AttachmentLoadJob
/usr/include/KF5/MessageCore/AttachmentPart
/usr/include/KF5/MessageCore/AttachmentPropertiesDialog
/usr/include/KF5/MessageCore/AttachmentUpdateJob
/usr/include/KF5/MessageCore/ImageCollector
/usr/include/KF5/MessageCore/MailingList
/usr/include/KF5/MessageCore/MessageCoreSettings
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/
/usr/include/KF5/MessageCore/MessageCoreUtil
/usr/include/KF5/MessageCore/MessageHelpers
/usr/include/KF5/MessageCore/NodeHelper
/usr/include/KF5/MessageCore/StringUtil
/usr/include/KF5/messagecore/
/usr/include/KF5/messagecore/attachmentcompressjob.h
/usr/include/KF5/messagecore/attachmentfromfolderjob.h
/usr/include/KF5/messagecore/attachmentfrommimecontentjob.h
/usr/include/KF5/messagecore/attachmentfromurlbasejob.h
/usr/include/KF5/messagecore/attachmentfromurljob.h
/usr/include/KF5/messagecore/attachmentfromurlutils.h
/usr/include/KF5/messagecore/attachmentloadjob.h
/usr/include/KF5/messagecore/attachmentpart.h
/usr/include/KF5/messagecore/attachmentpropertiesdialog.h
/usr/include/KF5/messagecore/attachmentupdatejob.h
/usr/include/KF5/messagecore/globalsettings_messagecore.h
/usr/include/KF5/messagecore/imagecollector.h
/usr/include/KF5/messagecore/mailinglist.h
/usr/include/KF5/messagecore/messagecore_export.h
/usr/include/KF5/messagecore/messagecoresettings.h
/usr/include/KF5/messagecore/messagecoreutil.h
/usr/include/KF5/messagecore/messagehelpers.h
/usr/include/KF5/messagecore/nodehelper.h
/usr/include/KF5/messagecore/stringutil.h
/usr/include/KF5/messagecore_version.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/cmake/
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/usr/lib/x86_64-linux-gnu/cmake/KF5MessageCore/KF5MessageCoreConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/KF5MessageCore/KF5MessageCoreConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/KF5MessageCore/KF5MessageCoreTargets-debian.cmake
/usr/lib/x86_64-linux-gnu/cmake/KF5MessageCore/KF5MessageCoreTargets.cmake
/usr/lib/x86_64-linux-gnu/qt5/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_MessageCore.pri
/usr/share/
/usr/share/doc/
/usr/share/doc/libkf5messagecore-dev/changelog.Debian.gz
/usr/share/doc/libkf5messagecore-dev/copyright
/usr/lib/x86_64-linux-gnu/libKF5MessageCore.so