diff -urNp -x '*.orig' procmail-3.22.org/config.h procmail-3.22/config.h
--- procmail-3.22.org/config.h	2001-09-11 04:53:50.000000000 +0000
+++ procmail-3.22/config.h	2022-04-04 18:03:38.380223294 +0000
@@ -77,8 +77,8 @@
 #define TRUSTED_IDS	{"root","daemon","uucp","mail","x400","network",\
 			 "list","slist","lists","news",0}
 
-/*#define NO_fcntl_LOCK		/* uncomment any of these three if you	     */
-/*#define NO_lockf_LOCK		/* definitely do not want procmail to make   */
+#define NO_fcntl_LOCK		/* uncomment any of these three if you	     */
+#define NO_lockf_LOCK		/* definitely do not want procmail to make   */
 /*#define NO_flock_LOCK		/* use of those kernel-locking methods	     */
 				/* If you set LOCKINGTEST to a binary number
 	than there's no need to set these.  These #defines are only useful