diff --git a/Build.sh b/Build.sh
index af44c70..e1961b1 100644
--- a/Build.sh
+++ b/Build.sh
@@ -1,5 +1,5 @@
 #!/bin/sh
-srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.619 2013/02/17 05:40:11 tg Exp $'
+srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.620 2013/02/17 07:06:15 tg Exp $'
 #-
 # Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
 #		2011, 2012, 2013
@@ -1529,7 +1529,7 @@ else
 		#define EXTERN
 		#define MKSH_INCLUDES_ONLY
 		#include "sh.h"
-		__RCSID("$MirOS: src/bin/mksh/Build.sh,v 1.619 2013/02/17 05:40:11 tg Exp $");
+		__RCSID("$MirOS: src/bin/mksh/Build.sh,v 1.620 2013/02/17 07:06:15 tg Exp $");
 		int main(void) { printf("Hello, World!\n"); return (0); }
 EOF
 	case $cm in
@@ -1809,38 +1809,29 @@ EOF
 #
 # check headers for declarations
 #
-save_tcfn=$tcfn; save_CC=$CC; save_LDFLAGS=$LDFLAGS; save_LIBS=$LIBS
-tcfn=conftest.o; CC="$CC -c -o $tcfn"; LDFLAGS=; LIBS=
-rm -f conftest.o
-ac_test '!' flock_decl flock 1 'if flock() does not need to be declared' <<-'EOF'
+ac_test flock_decl flock 1 'for declaration of flock()' <<-'EOF'
 	#define MKSH_INCLUDES_ONLY
 	#include "sh.h"
 	#if HAVE_SYS_FILE_H
 	#include <sys/file.h>
 	#endif
-	long flock(void);		/* this clashes if defined before */
-	int main(void) { return ((int)flock()); }
+	int main(void) { return ((flock)(0, 0)); }
 EOF
-rm -f conftest.o
-ac_test '!' revoke_decl revoke 1 'if revoke() does not need to be declared' <<-'EOF'
+ac_test revoke_decl revoke 1 'for declaration of revoke()' <<-'EOF'
 	#define MKSH_INCLUDES_ONLY
 	#include "sh.h"
-	long revoke(void);		/* this clashes if defined before */
-	int main(void) { return ((int)revoke()); }
+	int main(void) { return ((revoke)("")); }
 EOF
-rm -f conftest.o
 ac_test sys_errlist_decl sys_errlist 0 "for declaration of sys_errlist[] and sys_nerr" <<-'EOF'
 	#define MKSH_INCLUDES_ONLY
 	#include "sh.h"
 	int main(void) { return (*sys_errlist[sys_nerr - 1]); }
 EOF
-rm -f conftest.o
 ac_test sys_siglist_decl sys_siglist 0 'for declaration of sys_siglist[]' <<-'EOF'
 	#define MKSH_INCLUDES_ONLY
 	#include "sh.h"
 	int main(void) { return (sys_siglist[0][0]); }
 EOF
-tcfn=$save_tcfn; CC=$save_CC; LDFLAGS=$save_LDFLAGS; LIBS=$save_LIBS
 
 #
 # other checks