diff --git a/Build.sh b/Build.sh
index 157ace0..5e68179 100644
--- a/Build.sh
+++ b/Build.sh
@@ -1,5 +1,5 @@
 #!/bin/sh
-# $MirOS: src/bin/mksh/Build.sh,v 1.136 2007/01/17 23:54:39 tg Exp $
+# $MirOS: src/bin/mksh/Build.sh,v 1.137 2007/01/18 00:10:16 tg Exp $
 #-
 # Env: CC, CFLAGS, CPP, CPPFLAGS, LDFLAGS, LIBS, NOWARN, NROFF, TARGET_OS
 # CPPFLAGS recognised: MKSH_SMALL MKSH_NOPWNAM
@@ -346,6 +346,8 @@ if test 1 = $HAVE_SIGHANDLER_T; then
 	HAVE_SIG_T=1
 fi
 
+CPPFLAGS="$CPPFLAGS -DHAVE_SIG_T=$HAVE_SIG_T"
+
 #
 # Environment: signals
 #
diff --git a/sh.h b/sh.h
index 2a2db78..33dc569 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 1.105 2007/01/17 23:54:39 tg Exp $"
+#define MKSH_SH_H_ID "$MirOS: src/bin/mksh/sh.h,v 1.106 2007/01/18 00:10:16 tg Exp $"
 #define MKSH_VERSION "R29 2007/01/17"
 
 #if HAVE_SYS_PARAM_H
@@ -373,6 +373,10 @@ struct temp {
 #define shl_out		(&shf_iob[2])
 EXTERN int shl_stdout_ok;
 
+#if !HAVE_SIG_T
+typedef void (*sig_t)(int);
+#endif
+
 /*
  * trap handlers
  */