diff --git a/devel/rcs/Makefile b/devel/rcs/Makefile
--- a/devel/rcs/Makefile
+++ b/devel/rcs/Makefile
@@ -1,6 +1,5 @@
 PORTNAME=	rcs
-PORTVERSION=	5.9.4
-PORTREVISION=	1
+PORTVERSION=	5.10.0
 CATEGORIES=	devel
 MASTER_SITES=	GNU
 
diff --git a/devel/rcs/distinfo b/devel/rcs/distinfo
--- a/devel/rcs/distinfo
+++ b/devel/rcs/distinfo
@@ -1,2 +1,3 @@
-SHA256 (rcs-5.9.4.tar.xz) = 063d5a0d7da1821754b80c639cdae2c82b535c8ff4131f75dc7bbf0cd63a5dff
-SIZE (rcs-5.9.4.tar.xz) = 801360
+TIMESTAMP = 1620693895
+SHA256 (rcs-5.10.0.tar.xz) = 3a0d9f958c7ad303e475e8634654974edbe6deb3a454491f3857dc1889bac5c5
+SIZE (rcs-5.10.0.tar.xz) = 890872
diff --git a/devel/rcs/files/patch-doc b/devel/rcs/files/patch-doc
deleted file mode 100644
--- a/devel/rcs/files/patch-doc
+++ /dev/null
@@ -1,13 +0,0 @@
-makeinfo on FreeBSD before 10.x does not support @geq.
-
---- doc/rcs.texi.orig	2013-10-20 08:17:42.000000000 +0000
-+++ doc/rcs.texi	2014-03-08 19:08:44.068269980 +0000
-@@ -1789,7 +1789,7 @@
- If empty, the default branch is the highest branch on the trunk.
- 
- All @code{delta} nodes whose numbers consist of 2@var{n} fields (@var{n}
--@geq{} 2) (e.g., 3.1.1.1, 2.1.2.2) are linked as follows.
-+>= 2) (e.g., 3.1.1.1, 2.1.2.2) are linked as follows.
- All nodes whose first 2@var{n}@minus{}1 number fields are identical are
- linked through the @code{next} field in order of increasing numbers.
- For each such sequence, the @code{delta} node whose number is identical
diff --git a/devel/rcs/files/patch-src__b-complain.h b/devel/rcs/files/patch-src__b-complain.h
deleted file mode 100644
--- a/devel/rcs/files/patch-src__b-complain.h
+++ /dev/null
@@ -1,20 +0,0 @@
---- src/b-complain.h.orig	2013-04-20 20:08:38.000000000 +0200
-+++ src/b-complain.h	2015-02-24 22:01:39.465329000 +0100
-@@ -29,12 +29,11 @@
-   printf_string (2, 3);
- extern void generic_error (char const *who, char const *fmt, ...)
-   printf_string (2, 3);
--extern void generic_fatal (char const *who, char const *fmt, ...)
--  printf_string (2, 3) exiting;
--extern void fatal_syntax (size_t lno, char const *fmt, ...)
--  printf_string (2, 3) exiting;
--extern void fatal_sys (char const *who)
--  exiting;
-+extern exiting void generic_fatal (char const *who, char const *fmt, ...)
-+  printf_string (2, 3);
-+extern exiting void fatal_syntax (size_t lno, char const *fmt, ...)
-+  printf_string (2, 3);
-+extern exiting void fatal_sys (char const *who);
- 
- /* Idioms.  Here, prefix P stands for "program" (general operation);
-    M for "manifestation"; R for "repository".  */
diff --git a/devel/rcs/files/patch-src__b-fb.h b/devel/rcs/files/patch-src__b-fb.h
deleted file mode 100644
--- a/devel/rcs/files/patch-src__b-fb.h
+++ /dev/null
@@ -1,14 +0,0 @@
---- src/b-fb.h.orig	2013-04-20 20:08:38.000000000 +0200
-+++ src/b-fb.h	2015-02-24 21:58:19.888149000 +0100
-@@ -21,9 +21,9 @@
- */
- 
- extern int change_mode (int fd, mode_t mode);
--extern void Ierror (void) exiting;
-+exiting extern void Ierror (void);
- extern void testIerror (FILE *f);
--extern void Oerror (void) exiting;
-+exiting extern void Oerror (void);
- extern void testOerror (FILE *o);
- extern FILE *fopen_safer (char const *filename, char const *type);
- extern void Ozclose (FILE **p);
diff --git a/devel/rcs/files/patch-src__base.h b/devel/rcs/files/patch-src__base.h
deleted file mode 100644
--- a/devel/rcs/files/patch-src__base.h
+++ /dev/null
@@ -1,22 +0,0 @@
---- src/base.h.orig	2013-10-20 10:48:18.000000000 +0200
-+++ src/base.h	2015-02-24 21:57:04.059371000 +0100
-@@ -753,8 +753,7 @@
- int donerewrite (int changed, time_t newRCStime);
- void ORCSclose (void);
- void ORCSerror (void);
--void unexpected_EOF (void)
--  exiting;
-+exiting void unexpected_EOF (void);
- void initdiffcmd (struct diffcmd *dc);
- int getdiffcmd (struct fro *finfile, bool delimiter,
-                 FILE *foutfile, struct diffcmd *dc);
-@@ -829,8 +828,7 @@
-                       char datebuf[datesize + zonelenmax]);
- 
- /* rcsutil */
--void thank_you_and_goodnight (int const how)
--  exiting;
-+exiting void thank_you_and_goodnight (int const how);
- /* These are for ‘thank_you_and_goodnight’.  */
- #define TYAG_ORCSERROR     (1 << 3)
- #define TYAG_DIRTMPUNLINK  (1 << 2)