diff --git a/Build.sh b/Build.sh
index 5688b70..6c8639e 100644
--- a/Build.sh
+++ b/Build.sh
@@ -1,5 +1,5 @@
 #!/bin/sh
-srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.281 2008/03/05 17:00:33 tg Exp $'
+srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.282 2008/03/05 17:06:49 tg Exp $'
 #-
 # Environment used: CC CFLAGS CPPFLAGS LDFLAGS LIBS NOWARN NROFF TARGET_OS
 # CPPFLAGS recognised:	MKSH_SMALL MKSH_ASSUME_UTF8 MKSH_NOPWNAM MKSH_NOVI
@@ -950,6 +950,12 @@ ac_test '!' arc4random_pushb_decl arc4random_pushb 1 'if arc4random_pushb() does
 	int arc4random_pushb(char, int); /* this clashes if defined before */
 	int main(int ac, char *av[]) { return (arc4random_pushb(**av, ac)); }
 EOF
+ac_test '!' revoke_decl revoke 1 'if revoke() does not need to be declared' <<-'EOF'
+	#define MKSH_INCLUDES_ONLY
+	#include "sh.h"
+	long revoke(void);		/* this clashes if defined before */
+	int main(void) { return (revoke()); }
+EOF
 ac_test sys_siglist_decl sys_siglist 1 'if sys_siglist[] does not need to be declared' <<-'EOF'
 	#define MKSH_INCLUDES_ONLY
 	#include "sh.h"
diff --git a/Makefile b/Makefile
index 4181bc2..47ae492 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-# $MirOS: src/bin/mksh/Makefile,v 1.52 2008/02/29 16:38:40 tg Exp $
+# $MirOS: src/bin/mksh/Makefile,v 1.53 2008/03/05 17:06:50 tg Exp $
 #-
 # use CPPFLAGS=-DDEBUG __CRAZY=Yes to check for certain more stuff
 
@@ -22,8 +22,8 @@ CPPFLAGS+=	-DMKSH_ASSUME_UTF8 \
 		-DHAVE_MKNOD=1 -DHAVE_REVOKE=1 -DHAVE_SETMODE=1 \
 		-DHAVE_SETRESUGID=1 -DHAVE_SETGROUPS=1 -DHAVE_STRCASESTR=1 \
 		-DHAVE_STRLCPY=1 -DHAVE_ARC4RANDOM_DECL=1 \
-		-DHAVE_ARC4RANDOM_PUSHB_DECL=1 -DHAVE_SYS_SIGLIST_DECL=1 \
-		-DHAVE_PERSISTENT_HISTORY=1
+		-DHAVE_ARC4RANDOM_PUSHB_DECL=1 -DHAVE_REVOKE_DECL=1 \
+		-DHAVE_SYS_SIGLIST_DECL=1 -DHAVE_PERSISTENT_HISTORY=1
 COPTS+=		-std=gnu99 -Wall
 .endif
 
diff --git a/sh.h b/sh.h
index ce559ce..8363682 100644
--- a/sh.h
+++ b/sh.h
@@ -8,7 +8,7 @@
 /*	$OpenBSD: c_test.h,v 1.4 2004/12/20 11:34:26 otto Exp $	*/
 /*	$OpenBSD: tty.h,v 1.5 2004/12/20 11:34:26 otto Exp $	*/
 
-#define MKSH_SH_H_ID "$MirOS: src/bin/mksh/sh.h,v 1.192 2008/03/01 21:10:26 tg Exp $"
+#define MKSH_SH_H_ID "$MirOS: src/bin/mksh/sh.h,v 1.193 2008/03/05 17:06:50 tg Exp $"
 #define MKSH_VERSION "R33 2008/03/01"
 
 #if HAVE_SYS_PARAM_H
@@ -200,6 +200,10 @@ extern void arc4random_addrandom(unsigned char *, int)
 extern uint32_t arc4random_pushb(void *, size_t);
 #endif
 
+#if !HAVE_REVOKE_DECL
+extern int revoke(const char *);
+#endif
+
 #if !HAVE_SETMODE
 mode_t getmode(const void *, mode_t);
 void *setmode(const char *);