/usr/include/gstreamer-1.0/gst/gl/glprototypes/ is in libgstreamer-plugins-base1.0-dev 1.14.0-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/gstreamer-1.0/gst/gl/glprototypes/all_functions.h
/usr/include/gstreamer-1.0/gst/gl/glprototypes/base.h
/usr/include/gstreamer-1.0/gst/gl/glprototypes/blending.h
/usr/include/gstreamer-1.0/gst/gl/glprototypes/buffers.h
/usr/include/gstreamer-1.0/gst/gl/glprototypes/debug.h
/usr/include/gstreamer-1.0/gst/gl/glprototypes/eglimage.h
/usr/include/gstreamer-1.0/gst/gl/glprototypes/fbo.h
/usr/include/gstreamer-1.0/gst/gl/glprototypes/fixedfunction.h
/usr/include/gstreamer-1.0/gst/gl/glprototypes/gles.h
/usr/include/gstreamer-1.0/gst/gl/glprototypes/gstgl_compat.h
/usr/include/gstreamer-1.0/gst/gl/glprototypes/gstgl_gles2compat.h
/usr/include/gstreamer-1.0/gst/gl/glprototypes/opengl.h
/usr/include/gstreamer-1.0/gst/gl/glprototypes/query.h
/usr/include/gstreamer-1.0/gst/gl/glprototypes/shaders.h
/usr/include/gstreamer-1.0/gst/gl/glprototypes/sync.h
/usr/include/gstreamer-1.0/gst/gl/glprototypes/vao.h