--- sendmail-8.17.1.old/include/sm/conf.h
+++ sendmail-8.17.1/include/sm/conf.h
@@ -76,6 +76,8 @@
 **	change these.
 **********************************************************************/
 
+#define HASFLOCK 1
+
 /*
 **  HP-UX -- tested for 8.07, 9.00, and 9.01.
 **