AC_ARG_WITH([sdl2], [AS_HELP_STRING([--with-sdl2], [compile with SDL2 library @<:@default=check@:>@]) ], [], [with_sdl2="check"])
AC_ARG_WITH([glew], [AS_HELP_STRING([--with-glew], [compile with GLEW library @<:@default=check@:>@]) ], [], [with_glew="check"])
AC_ARG_WITH([sdl2], [AS_HELP_STRING([--with-sdl2], [compile with SDL2 library @<:@default=check@:>@]) ], [], [with_sdl2="check"])
AC_ARG_WITH([glew], [AS_HELP_STRING([--with-glew], [compile with GLEW library @<:@default=check@:>@]) ], [], [with_glew="check"])