diff --git a/Build.sh b/Build.sh
index 10fd940..1443cb1 100644
--- a/Build.sh
+++ b/Build.sh
@@ -1,5 +1,5 @@
 #!/bin/sh
-srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.361 2008/10/25 12:58:41 tg Exp $'
+srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.362 2008/10/26 21:51:25 ahoka Exp $'
 #-
 # Environment used: CC CFLAGS CPPFLAGS LDFLAGS LIBS NOWARN NROFF TARGET_OS
 # CPPFLAGS recognised:	MKSH_SMALL MKSH_ASSUME_UTF8 MKSH_NOPWNAM MKSH_NOVI
@@ -1037,6 +1037,11 @@ ac_test mkstemp <<-'EOF'
 	int main(void) { char tmpl[] = "X"; return (mkstemp(tmpl)); }
 EOF
 
+ac_test nice <<-'EOF'
+	#include <unistd.h>
+	int main(void) { return (nice(4)); }
+EOF
+
 ac_test setlocale_ctype '' 'setlocale(LC_CTYPE, "")' <<-'EOF'
 	#include <locale.h>
 	#include <stddef.h>
diff --git a/jobs.c b/jobs.c
index c781684..6c5c80f 100644
--- a/jobs.c
+++ b/jobs.c
@@ -2,7 +2,7 @@
 
 #include "sh.h"
 
-__RCSID("$MirOS: src/bin/mksh/jobs.c,v 1.37 2008/10/13 23:06:03 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/jobs.c,v 1.38 2008/10/26 21:51:26 ahoka Exp $");
 
 /* Order important! */
 #define PRUNNING	0
@@ -402,8 +402,10 @@ exchild(struct op *t, int flags, /* used if XPCLOSE or XCCLOSE */ int close_fd)
 				setsig(&sigtraps[tt_sigs[i]], SIG_DFL,
 				    SS_RESTORE_DFL|SS_FORCE);
 		}
+#if HAVE_NICE
 		if (Flag(FBGNICE) && (flags & XBGND))
 			(void)nice(4);
+#endif
 		if ((flags & XBGND) && !Flag(FMONITOR)) {
 			setsig(&sigtraps[SIGINT], SIG_IGN,
 			    SS_RESTORE_IGN|SS_FORCE);
diff --git a/misc.c b/misc.c
index 8d2ae23..fc184fc 100644
--- a/misc.c
+++ b/misc.c
@@ -6,7 +6,7 @@
 #include <grp.h>
 #endif
 
-__RCSID("$MirOS: src/bin/mksh/misc.c,v 1.86 2008/10/13 23:06:03 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/misc.c,v 1.87 2008/10/26 21:51:26 ahoka Exp $");
 
 #undef USE_CHVT
 #if defined(TIOCSCTTY) && !defined(MKSH_SMALL)
@@ -113,7 +113,9 @@ const struct shoption options[] = {
 	{ "arc4random",	  0,		OF_ANY },
 #endif
 	{ "braceexpand",  0,		OF_ANY }, /* non-standard */
+#if HAVE_NICE
 	{ "bgnice",	  0,		OF_ANY },
+#endif
 	{ NULL,		'c',	    OF_CMDLINE },
 	{ "emacs",	  0,		OF_ANY },
 	{ "errexit",	'e',		OF_ANY },
diff --git a/sh.h b/sh.h
index 0d6ed95..2bc1c65 100644
--- a/sh.h
+++ b/sh.h
@@ -100,7 +100,7 @@
 #define __SCCSID(x)	__IDSTRING(sccsid,x)
 
 #ifdef EXTERN
-__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.246 2008/10/26 20:59:40 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.247 2008/10/26 21:51:27 ahoka Exp $");
 #endif
 #define MKSH_VERSION "R36 2008/10/26"
 
@@ -434,7 +434,9 @@ enum sh_flag {
 	FARC4RANDOM,	/* use 0:rand(3) 1:arc4random(3) 2:switch on write */
 #endif
 	FBRACEEXPAND,	/* enable {} globbing */
+#if HAVE_NICE
 	FBGNICE,	/* bgnice */
+#endif
 	FCOMMAND,	/* -c: (invocation) execute specified command */
 	FEMACS,		/* emacs command editing */
 	FERREXIT,	/* -e: quit on error */