diff --git a/bin/rmail/Makefile b/bin/rmail/Makefile
index 21f3ceb1658..913d9fdc4d8 100644
--- a/bin/rmail/Makefile
+++ b/bin/rmail/Makefile
@@ -34,3 +34,5 @@ sm_os.h: ${SENDMAIL_DIR}/include/sm/os/sm_os_freebsd.h .NOMETA
 	ln -sf ${.ALLSRC} ${.TARGET}
 
 .include <bsd.prog.mk>
+
+CWARNFLAGS+= ${NO_WDEPRECATED_NON_PROTOTYPE}
diff --git a/lib/libsm/Makefile b/lib/libsm/Makefile
index eed69cecbf0..7c13939bb6a 100644
--- a/lib/libsm/Makefile
+++ b/lib/libsm/Makefile
@@ -42,3 +42,5 @@ sm_os.h: ${SENDMAIL_DIR}/include/sm/os/sm_os_freebsd.h .NOMETA
 	ln -sf ${.ALLSRC} ${.TARGET}
 
 .include <bsd.lib.mk>
+
+CWARNFLAGS+= ${NO_WDEPRECATED_NON_PROTOTYPE}
diff --git a/lib/libsmdb/Makefile b/lib/libsmdb/Makefile
index 893e3d173a0..5dff6b572d1 100644
--- a/lib/libsmdb/Makefile
+++ b/lib/libsmdb/Makefile
@@ -24,3 +24,5 @@ sm_os.h: ${SENDMAIL_DIR}/include/sm/os/sm_os_freebsd.h .NOMETA
 	ln -sf ${.ALLSRC} ${.TARGET}
 
 .include <bsd.lib.mk>
+
+CWARNFLAGS+= ${NO_WDEPRECATED_NON_PROTOTYPE}
diff --git a/lib/libsmutil/Makefile b/lib/libsmutil/Makefile
index 7bbd21e21bb..4274a8470f4 100644
--- a/lib/libsmutil/Makefile
+++ b/lib/libsmutil/Makefile
@@ -31,3 +31,5 @@ sm_os.h: ${SENDMAIL_DIR}/include/sm/os/sm_os_freebsd.h .NOMETA
 	ln -sf ${.ALLSRC} ${.TARGET}
 
 .include <bsd.lib.mk>
+
+CWARNFLAGS+= ${NO_WDEPRECATED_NON_PROTOTYPE}
diff --git a/libexec/mail.local/Makefile b/libexec/mail.local/Makefile
index a642326228b..3e6d61d001f 100644
--- a/libexec/mail.local/Makefile
+++ b/libexec/mail.local/Makefile
@@ -28,3 +28,5 @@ sm_os.h: ${SENDMAIL_DIR}/include/sm/os/sm_os_freebsd.h .NOMETA
 	ln -sf ${.ALLSRC} ${.TARGET}
 
 .include <bsd.prog.mk>
+
+CWARNFLAGS+= ${NO_WDEPRECATED_NON_PROTOTYPE}
diff --git a/libexec/smrsh/Makefile b/libexec/smrsh/Makefile
index dc4f7c21069..1cc98e1bb48 100644
--- a/libexec/smrsh/Makefile
+++ b/libexec/smrsh/Makefile
@@ -27,3 +27,5 @@ sm_os.h: ${SENDMAIL_DIR}/include/sm/os/sm_os_freebsd.h .NOMETA
 	ln -sf ${.ALLSRC} ${.TARGET}
 
 .include <bsd.prog.mk>
+
+CWARNFLAGS+= ${NO_WDEPRECATED_NON_PROTOTYPE}
diff --git a/usr.bin/vacation/Makefile b/usr.bin/vacation/Makefile
index ae3372f46fc..5a99e8a2ac0 100644
--- a/usr.bin/vacation/Makefile
+++ b/usr.bin/vacation/Makefile
@@ -26,3 +26,5 @@ sm_os.h: ${SENDMAIL_DIR}/include/sm/os/sm_os_freebsd.h .NOMETA
 	ln -sf ${.ALLSRC} ${.TARGET}
 
 .include <bsd.prog.mk>
+
+CWARNFLAGS+= ${NO_WDEPRECATED_NON_PROTOTYPE}
diff --git a/usr.sbin/editmap/Makefile b/usr.sbin/editmap/Makefile
index 04ce398f2d5..8a490d9cfdc 100644
--- a/usr.sbin/editmap/Makefile
+++ b/usr.sbin/editmap/Makefile
@@ -27,3 +27,5 @@ sm_os.h: ${SENDMAIL_DIR}/include/sm/os/sm_os_freebsd.h .NOMETA
 	ln -sf ${.ALLSRC} ${.TARGET}
 
 .include <bsd.prog.mk>
+
+CWARNFLAGS+= ${NO_WDEPRECATED_NON_PROTOTYPE}
diff --git a/usr.sbin/mailstats/Makefile b/usr.sbin/mailstats/Makefile
index b8dd8922555..c0d8bfe3d07 100644
--- a/usr.sbin/mailstats/Makefile
+++ b/usr.sbin/mailstats/Makefile
@@ -28,3 +28,5 @@ sm_os.h: ${SENDMAIL_DIR}/include/sm/os/sm_os_freebsd.h .NOMETA
 	ln -sf ${.ALLSRC} ${.TARGET}
 
 .include <bsd.prog.mk>
+
+CWARNFLAGS+= ${NO_WDEPRECATED_NON_PROTOTYPE}
diff --git a/usr.sbin/makemap/Makefile b/usr.sbin/makemap/Makefile
index 2477060b793..ed89eadabbf 100644
--- a/usr.sbin/makemap/Makefile
+++ b/usr.sbin/makemap/Makefile
@@ -28,3 +28,5 @@ sm_os.h: ${SENDMAIL_DIR}/include/sm/os/sm_os_freebsd.h .NOMETA
 	ln -sf ${.ALLSRC} ${.TARGET}
 
 .include <bsd.prog.mk>
+
+CWARNFLAGS+= ${NO_WDEPRECATED_NON_PROTOTYPE}
diff --git a/usr.sbin/praliases/Makefile b/usr.sbin/praliases/Makefile
index fbef36565bd..7400ab94430 100644
--- a/usr.sbin/praliases/Makefile
+++ b/usr.sbin/praliases/Makefile
@@ -28,3 +28,5 @@ sm_os.h: ${SENDMAIL_DIR}/include/sm/os/sm_os_freebsd.h .NOMETA
 	ln -sf ${.ALLSRC} ${.TARGET}
 
 .include <bsd.prog.mk>
+
+CWARNFLAGS+= ${NO_WDEPRECATED_NON_PROTOTYPE}