dnl [Prefer the Mesa library over a vendors native OpenGL library (default=yes)],
dnl with_Mesa_help_string)
dnl AC_ARG_ENABLE(Mesa, $with_Mesa_help_string, use_Mesa=$enableval, use_Mesa=yes)
dnl [Prefer the Mesa library over a vendors native OpenGL library (default=yes)],
dnl with_Mesa_help_string)
dnl AC_ARG_ENABLE(Mesa, $with_Mesa_help_string, use_Mesa=$enableval, use_Mesa=yes)