libformsgl-dev: package-installs-file-to-usr-something-x11 usr/include/X11/
libformsgl-dev: use-of-compat-symlink usr/include/X11/
libformsgl-dev: package-installs-file-to-usr-something-x11 usr/include/X11/glcanvas.h
libformsgl-dev: use-of-compat-symlink usr/include/X11/glcanvas.h
