diff --git a/devel/rcs/Makefile b/devel/rcs/Makefile
index 0f0a6eff008b..791e0619ee8b 100644
--- a/devel/rcs/Makefile
+++ b/devel/rcs/Makefile
@@ -1,19 +1,20 @@
 PORTNAME=	rcs
 PORTVERSION=	5.10.1
+PORTREVISION=	1
 CATEGORIES=	devel
 MASTER_SITES=	GNU
 
 MAINTAINER=	portmaster@bsdforge.com
 COMMENT=	Version control system
 WWW=		https://www.gnu.org/software/rcs/
 
 LICENSE=	GPLv3
 
 USES=		tar:lz
 GNU_CONFIGURE=	yes
 
 CONFLICTS_INSTALL=	rcs57
 
 INFO=	rcs
 
 .include <bsd.port.mk>
diff --git a/devel/rcs/files/patch-lib_obstack.h b/devel/rcs/files/patch-lib_obstack.h
new file mode 100644
index 000000000000..bd3a602b1199
--- /dev/null
+++ b/devel/rcs/files/patch-lib_obstack.h
@@ -0,0 +1,11 @@
+--- lib/obstack.h.orig	2022-01-27 03:00:30 UTC
++++ lib/obstack.h
+@@ -226,7 +226,7 @@ extern _OBSTACK_SIZE_T _obstack_memory_used (struct ob
+    more memory.  This can be set to a user defined function which
+    should either abort gracefully or use longjump - but shouldn't
+    return.  The default action is to print a message and abort.  */
+-extern __attribute_noreturn__ void (*obstack_alloc_failed_handler) (void);
++extern void (*obstack_alloc_failed_handler) (void);
+ 
+ /* Exit value used when 'print_and_abort' is used.  */
+ extern int obstack_exit_failure;