1 files changed, 4 insertions, 7 deletions
diff --git a/stdbool.h b/stdbool.h
index 3768ec9..46d637e 100644
--- a/stdbool.h
+++ b/stdbool.h
@@ -27,16 +27,13 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
-#if	(defined __STDC_VERSION__ && 199901 <= __STDC_VERSION__)
-/* ./src/stdbool/__bool_true_false_are_defined.c */
+#if !(defined __STDC_VERSION__ && 199901L <= __STDC_VERSION__)
+# error <stdbool.h> requires C99 or higher
+#endif
+
 #define __bool_true_false_are_defined                                        (1)
-/* ./src/stdbool/bool.c */
 #define bool                                                               _Bool
-/* ./src/stdbool/false.c */
 #define false                                                                (0)
-/* ./src/stdbool/true.c */
 #define true                                                                 (1)
-#endif
-
 
 #endif