$(if $(call configure_var_fn,CFLAGS), \
CFLAGS="$(CFLAGS) $(call configure_var_fn,CFLAGS)") \
$(if $(call configure_var_fn,CCASFLAGS), \
$(if $(call configure_var_fn,CFLAGS), \
CFLAGS="$(CFLAGS) $(call configure_var_fn,CFLAGS)") \
$(if $(call configure_var_fn,CCASFLAGS), \