/usr/lib/ghc-doc/hoogle/GLUT.txt is in libghc-glut-doc 2.4.0.0-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-glut-doc/html/GLUT.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-glut-doc/html/GLUT.txt