/usr/ is in libforge-dev 0.9.2-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/ComputeCopy.h
/usr/include/fg/
/usr/include/fg/chart.h
/usr/include/fg/defines.h
/usr/include/fg/exception.h
/usr/include/fg/font.h
/usr/include/fg/histogram.h
/usr/include/fg/image.h
/usr/include/fg/plot.h
/usr/include/fg/surface.h
/usr/include/fg/util.h
/usr/include/fg/vector_field.h
/usr/include/fg/version.h
/usr/include/fg/window.h
/usr/include/forge.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/cmake/
/usr/lib/x86_64-linux-gnu/cmake/Forge/
/usr/lib/x86_64-linux-gnu/cmake/Forge/ForgeConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Forge/ForgeConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Forge/ForgeTargets-none.cmake
/usr/lib/x86_64-linux-gnu/cmake/Forge/ForgeTargets.cmake
/usr/share/
/usr/share/doc/
/usr/share/doc/libforge-dev/
/usr/share/doc/libforge-dev/copyright
/usr/lib/x86_64-linux-gnu/libforge.so
/usr/share/doc/libforge-dev/changelog.Debian.gz