/usr/include/gpaste/ is in libgpaste-dev 3.28.0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/gpaste/gpaste-bus-object.h
/usr/include/gpaste/gpaste-bus.h
/usr/include/gpaste/gpaste-client.h
/usr/include/gpaste/gpaste-clipboard.h
/usr/include/gpaste/gpaste-clipboards-manager.h
/usr/include/gpaste/gpaste-daemon.h
/usr/include/gpaste/gpaste-file-backend.h
/usr/include/gpaste/gpaste-gdbus-defines.h
/usr/include/gpaste/gpaste-gnome-shell-client.h
/usr/include/gpaste/gpaste-gsettings-keys.h
/usr/include/gpaste/gpaste-history.h
/usr/include/gpaste/gpaste-image-item.h
/usr/include/gpaste/gpaste-item-enums.h
/usr/include/gpaste/gpaste-item.h
/usr/include/gpaste/gpaste-keybinder.h
/usr/include/gpaste/gpaste-keybinding.h
/usr/include/gpaste/gpaste-macros.h
/usr/include/gpaste/gpaste-make-password-keybinding.h
/usr/include/gpaste/gpaste-password-item.h
/usr/include/gpaste/gpaste-pop-keybinding.h
/usr/include/gpaste/gpaste-screensaver-client.h
/usr/include/gpaste/gpaste-search-provider.h
/usr/include/gpaste/gpaste-settings-ui-panel.h
/usr/include/gpaste/gpaste-settings-ui-stack.h
/usr/include/gpaste/gpaste-settings-ui-widget.h
/usr/include/gpaste/gpaste-settings.h
/usr/include/gpaste/gpaste-show-history-keybinding.h
/usr/include/gpaste/gpaste-special-atom.h
/usr/include/gpaste/gpaste-storage-backend.h
/usr/include/gpaste/gpaste-sync-clipboard-to-primary-keybinding.h
/usr/include/gpaste/gpaste-sync-primary-to-clipboard-keybinding.h
/usr/include/gpaste/gpaste-text-item.h
/usr/include/gpaste/gpaste-ui-about.h
/usr/include/gpaste/gpaste-ui-backup-history.h
/usr/include/gpaste/gpaste-ui-delete-history.h
/usr/include/gpaste/gpaste-ui-delete-item.h
/usr/include/gpaste/gpaste-ui-edit-item.h
/usr/include/gpaste/gpaste-ui-empty-history.h
/usr/include/gpaste/gpaste-ui-empty-item.h
/usr/include/gpaste/gpaste-ui-header.h
/usr/include/gpaste/gpaste-ui-history-action.h
/usr/include/gpaste/gpaste-ui-history-actions.h
/usr/include/gpaste/gpaste-ui-history.h
/usr/include/gpaste/gpaste-ui-item-action.h
/usr/include/gpaste/gpaste-ui-item-skeleton.h
/usr/include/gpaste/gpaste-ui-item.h
/usr/include/gpaste/gpaste-ui-keybinding.h
/usr/include/gpaste/gpaste-ui-new-item.h
/usr/include/gpaste/gpaste-ui-panel-history.h
/usr/include/gpaste/gpaste-ui-panel.h
/usr/include/gpaste/gpaste-ui-reexec.h
/usr/include/gpaste/gpaste-ui-search-bar.h
/usr/include/gpaste/gpaste-ui-search.h
/usr/include/gpaste/gpaste-ui-settings.h
/usr/include/gpaste/gpaste-ui-shortcuts-window.h
/usr/include/gpaste/gpaste-ui-switch.h
/usr/include/gpaste/gpaste-ui-upload-item.h
/usr/include/gpaste/gpaste-ui-window.h
/usr/include/gpaste/gpaste-update-enums.h
/usr/include/gpaste/gpaste-upload-keybinding.h
/usr/include/gpaste/gpaste-uris-item.h
/usr/include/gpaste/gpaste-util.h
/usr/include/gpaste/gpaste.h