/usr/ is in libglfw3-dev 3.2.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/GLFW/
/usr/include/GLFW/glfw3.h
/usr/include/GLFW/glfw3native.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/cmake/
/usr/lib/x86_64-linux-gnu/cmake/glfw3/
/usr/lib/x86_64-linux-gnu/cmake/glfw3/glfw3Config.cmake
/usr/lib/x86_64-linux-gnu/cmake/glfw3/glfw3ConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/glfw3/glfw3Targets-none.cmake
/usr/lib/x86_64-linux-gnu/cmake/glfw3/glfw3Targets.cmake
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/glfw3.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libglfw3-dev/
/usr/share/doc/libglfw3-dev/copyright
/usr/lib/x86_64-linux-gnu/libglfw.so
/usr/share/doc/libglfw3-dev/changelog.Debian.gz