Index: contrib/sendmail/include/sm/gen.h
===================================================================
--- contrib/sendmail/include/sm/gen.h	(revision 248230)
+++ contrib/sendmail/include/sm/gen.h	(working copy)
@@ -51,7 +51,7 @@
 **  Define bool, true, false (from the C99 standard)
 */
 
-# if SM_CONF_STDBOOL_H
+# if SM_CONF_STDBOOL_H && 0
 #  include <stdbool.h>
 # else /* SM_CONF_STDBOOL_H */
 #  ifndef __cplusplus