diff --git a/games/corewars/Makefile b/games/corewars/Makefile
index f4bb9e4e1e7..1b5c34804cf 100644
--- a/games/corewars/Makefile
+++ b/games/corewars/Makefile
@@ -1,22 +1,22 @@
-# $OpenBSD: Makefile,v 1.28 2019/07/12 21:02:20 sthen Exp $
+# $OpenBSD: Makefile,v 1.29 2021/02/28 06:13:34 bket Exp $
 
 COMMENT=	computer simulation game
 
 DISTNAME=	corewars-0.9.13
-REVISION=	9
+REVISION=	10
 
 CATEGORIES=	games x11
 
-HOMEPAGE=	http://corewars.org/
+HOMEPAGE=	https://corewars.org/
 
 # GPLv2
 PERMIT_PACKAGE=	Yes
 
-WANTLIB =  GL X11 Xcomposite Xcursor Xdamage Xext Xfixes Xi Xinerama
-WANTLIB += Xrandr Xrender atk-1.0 c cairo expat fontconfig freetype
+WANTLIB += X11 Xcomposite Xcursor Xdamage Xext Xfixes Xi Xinerama
+WANTLIB += Xrandr Xrender atk-1.0 c cairo fontconfig freetype
 WANTLIB += gdk-x11-2.0 gdk_pixbuf-2.0 gio-2.0 glib-2.0 gobject-2.0
-WANTLIB += gtk-x11-2.0 iconv intl m pango-1.0 pangocairo-1.0
-WANTLIB += pangoft2-1.0 pixman-1 png pthread xcb xcb-render xcb-shm z
+WANTLIB += gtk-x11-2.0 harfbuzz intl m pango-1.0 pangocairo-1.0
+WANTLIB += pangoft2-1.0 z
 
 LIB_DEPENDS=	x11/gtk+2
 
diff --git a/games/corewars/patches/patch-src_parser-cw_y b/games/corewars/patches/patch-src_parser-cw_y
new file mode 100644
index 00000000000..278fc1582fc
--- /dev/null
+++ b/games/corewars/patches/patch-src_parser-cw_y
@@ -0,0 +1,18 @@
+$OpenBSD: patch-src_parser-cw_y,v 1.1 2021/02/28 06:13:34 bket Exp $
+
+Fix -no-common build error.
+
+Index: src/parser-cw.y
+--- src/parser-cw.y.orig
++++ src/parser-cw.y
+@@ -29,8 +29,8 @@
+ #include "program-cw.h"
+ #include "options.h"
+   
+-  int current_line;
+-  struct cw_line *root_line;
++  static int current_line;
++  static struct cw_line *root_line;
+   char cw_error_message[1024];
+   
+   void cw_error (char *s);
diff --git a/games/corewars/patches/patch-src_parser-rc_y b/games/corewars/patches/patch-src_parser-rc_y
new file mode 100644
index 00000000000..54fb073d8d5
--- /dev/null
+++ b/games/corewars/patches/patch-src_parser-rc_y
@@ -0,0 +1,19 @@
+$OpenBSD: patch-src_parser-rc_y,v 1.1 2021/02/28 06:13:34 bket Exp $
+
+Fix -no-common build error.
+
+Index: src/parser-rc.y
+--- src/parser-rc.y.orig
++++ src/parser-rc.y
+@@ -66,8 +66,9 @@
+   void free_expr(struct expr *expr);
+   struct expr *copy_expr(struct expr *expr);
+ 
+-  int current_line, *current_cell;
+-  struct line *root_line;
++  int *current_cell;
++  static int current_line;
++  static struct line *root_line;
+   struct expr *org;
+   struct label *label_list;
+   struct label *for_index;
diff --git a/games/corewars/pkg/DESCR b/games/corewars/pkg/DESCR
index 554fc8aabe0..dff5a9c912f 100644
--- a/games/corewars/pkg/DESCR
+++ b/games/corewars/pkg/DESCR
@@ -1,6 +1,6 @@
-Corewars is a simulation game where a number of warriors try to crash 
-each other while they are running in a virtual computer. The warriors 
-can be written in one of two assembler-like languages called Corewars 
-and Redcode. Corewars is the default language  and is easier to learn 
-and understand. Redcode provides more advanced and powerful 
-instructions but also requires more time to learn. 
+Corewars is a simulation game where a number of warriors try to crash
+each other while they are running in a virtual computer. The warriors
+can be written in one of two assembler-like languages called Corewars
+and Redcode. Corewars is the default language  and is easier to learn
+and understand. Redcode provides more advanced and powerful
+instructions but also requires more time to learn.