/usr/include/glbinding/gl30/ is in libglbinding-dev 2.1.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/glbinding/gl30/bitfield.h
/usr/include/glbinding/gl30/boolean.h
/usr/include/glbinding/gl30/enum.h
/usr/include/glbinding/gl30/functions.h
/usr/include/glbinding/gl30/gl.h
/usr/include/glbinding/gl30/types.h
/usr/include/glbinding/gl30/values.h
/usr/include/glbinding/gl30ext/bitfield.h
/usr/include/glbinding/gl30ext/boolean.h
/usr/include/glbinding/gl30ext/enum.h
/usr/include/glbinding/gl30ext/functions.h
/usr/include/glbinding/gl30ext/gl.h
/usr/include/glbinding/gl30ext/types.h
/usr/include/glbinding/gl30ext/values.h