/usr/src/castle-game-engine-5.0.0/opengl/ is in castle-game-engine-src 5.0.0-3.
This file is owned by root:root, with mode 0o755.
..
/usr/src/castle-game-engine-5.0.0/opengl/castlecurves.pas
/usr/src/castle-game-engine-5.0.0/opengl/castlefonts.pas
/usr/src/castle-game-engine-5.0.0/opengl/castleglcubemaps.pas
/usr/src/castle-game-engine-5.0.0/opengl/castlegles20.pas
/usr/src/castle-game-engine-5.0.0/opengl/castleglimages.pas
/usr/src/castle-game-engine-5.0.0/opengl/castlegloutlinefonts.pas
/usr/src/castle-game-engine-5.0.0/opengl/castleglshaders.pas
/usr/src/castle-game-engine-5.0.0/opengl/castleglshadowvolumes.pas
/usr/src/castle-game-engine-5.0.0/opengl/castleglutils.pas
/usr/src/castle-game-engine-5.0.0/opengl/castleglversion.pas
/usr/src/castle-game-engine-5.0.0/opengl/castlescreeneffects.pas
/usr/src/castle-game-engine-5.0.0/opengl/glsl/
/usr/src/castle-game-engine-5.0.0/opengl/glsl/Makefile
/usr/src/castle-game-engine-5.0.0/opengl/glsl/image.fs
/usr/src/castle-game-engine-5.0.0/opengl/glsl/image.fs.inc
/usr/src/castle-game-engine-5.0.0/opengl/glsl/image.vs
/usr/src/castle-game-engine-5.0.0/opengl/glsl/image.vs.inc
/usr/src/castle-game-engine-5.0.0/opengl/glsl/rectangle.fs
/usr/src/castle-game-engine-5.0.0/opengl/glsl/rectangle.fs.inc
/usr/src/castle-game-engine-5.0.0/opengl/glsl/rectangle.vs
/usr/src/castle-game-engine-5.0.0/opengl/glsl/rectangle.vs.inc
/usr/src/castle-game-engine-5.0.0/opengl/openglmac.inc