/usr/lib/x86_64-linux-gnu/libGLEW.so is in libglew1.6-dev 1.6.0-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libGLEW.so.1.6.0
/usr/lib/x86_64-linux-gnu/libGLEW.so.1.6.0