/usr/lib/x86_64-linux-gnu/ is in libtomahawk-dev 0.8.4+dfsg1-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/cmake/
/usr/lib/x86_64-linux-gnu/cmake/Tomahawk/
/usr/lib/x86_64-linux-gnu/cmake/Tomahawk/TomahawkConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Tomahawk/TomahawkLibraryDepends.cmake
/usr/lib/x86_64-linux-gnu/cmake/Tomahawk/TomahawkLibraryDepends-relwithdebinfo.cmake
/usr/lib/x86_64-linux-gnu/cmake/Tomahawk/TomahawkAddLibrary.cmake
/usr/lib/x86_64-linux-gnu/cmake/Tomahawk/TomahawkAddPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Tomahawk/TomahawkConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Tomahawk/TomahawkUse.cmake
/usr/lib/x86_64-linux-gnu/libtomahawk-widgets.so
/usr/lib/x86_64-linux-gnu/libtomahawk-playdarapi.so
/usr/lib/x86_64-linux-gnu/libtomahawk.so