/usr/include/ is in libktp-dev 4:15.12.3-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/KTp/
/usr/include/KTp/message-processor.h
/usr/include/KTp/telepathy-handler-application.h
/usr/include/KTp/abstract-message-filter.h
/usr/include/KTp/ktpcommoninternals_export.h
/usr/include/KTp/contact-factory.h
/usr/include/KTp/service-availability-checker.h
/usr/include/KTp/message-filter-config-manager.h
/usr/include/KTp/logs-importer.h
/usr/include/KTp/OTR/
/usr/include/KTp/OTR/types.h
/usr/include/KTp/OTR/proxy-service-interface.h
/usr/include/KTp/OTR/channel-proxy-interface.h
/usr/include/KTp/OTR/utils.h
/usr/include/KTp/OTR/constants.h
/usr/include/KTp/OTR/channel-adapter.h
/usr/include/KTp/OTR/ktpotr_export.h
/usr/include/KTp/types.h
/usr/include/KTp/presence.h
/usr/include/KTp/actions.h
/usr/include/KTp/core.h
/usr/include/KTp/message-context.h
/usr/include/KTp/error-dictionary.h
/usr/include/KTp/debug.h
/usr/include/KTp/global-contact-manager.h
/usr/include/KTp/Models/
/usr/include/KTp/Models/ktpmodels_export.h
/usr/include/KTp/Models/groups-tree-proxy-model.h
/usr/include/KTp/Models/contacts-filter-model.h
/usr/include/KTp/Models/text-channel-watcher-proxy-model.h
/usr/include/KTp/Models/rooms-model.h
/usr/include/KTp/Models/contacts-model.h
/usr/include/KTp/Models/abstract-grouping-proxy-model.h
/usr/include/KTp/Models/accounts-list-model.h
/usr/include/KTp/Models/accounts-tree-proxy-model.h
/usr/include/KTp/Models/presence-model.h
/usr/include/KTp/Models/contacts-list-model.h
/usr/include/KTp/global-presence.h
/usr/include/KTp/contact.h
/usr/include/KTp/Widgets/
/usr/include/KTp/Widgets/settings-kcm-dialog.h
/usr/include/KTp/Widgets/contact-info-dialog.h
/usr/include/KTp/Widgets/contact-grid-widget.h
/usr/include/KTp/Widgets/start-chat-dialog.h
/usr/include/KTp/Widgets/contact-grid-dialog.h
/usr/include/KTp/Widgets/contact-view-widget.h
/usr/include/KTp/Widgets/accounts-combo-box.h
/usr/include/KTp/Widgets/join-chat-room-dialog.h
/usr/include/KTp/Widgets/add-contact-dialog.h
/usr/include/KTp/Widgets/notification-config-dialog.h
/usr/include/KTp/persistent-contact.h
/usr/include/KTp/outgoing-message.h
/usr/include/KTp/pending-wallet.h
/usr/include/KTp/Logger/
/usr/include/KTp/Logger/pending-logger-search.h
/usr/include/KTp/Logger/log-search-hit.h
/usr/include/KTp/Logger/pending-logger-operation.h
/usr/include/KTp/Logger/pending-logger-entities.h
/usr/include/KTp/Logger/log-manager.h
/usr/include/KTp/Logger/ktplogger_export.h
/usr/include/KTp/Logger/scrollback-manager.h
/usr/include/KTp/Logger/log-message.h
/usr/include/KTp/Logger/log-entity.h
/usr/include/KTp/Logger/pending-logger-dates.h
/usr/include/KTp/Logger/abstract-logger-plugin.h
/usr/include/KTp/Logger/pending-logger-logs.h
/usr/include/KTp/wallet-utils.h
/usr/include/KTp/text-parser.h
/usr/include/KTp/wallet-interface.h
/usr/include/KTp/circular-countdown.h
/usr/include/KTp/message.h