From f790841641f8dace165b51088959586ef596ff81 Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Mon, 9 Oct 2017 06:48:51 -0600
Subject: [PATCH] Fix a copy paste error in recent config/z80sim change.

---
 configs/z80sim/src/Makefile     | 4 ++--
 configs/z80sim/src/z80_serial.c | 5 +++--
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/configs/z80sim/src/Makefile b/configs/z80sim/src/Makefile
index 0c5e71b255..2bedb8da15 100644
--- a/configs/z80sim/src/Makefile
+++ b/configs/z80sim/src/Makefile
@@ -1,7 +1,7 @@
 ############################################################################
 # configs/z80sim/src/Makefile
 #
-#   Copyright (C) 2007, 2008, 2012 Gregory Nutt. All rights reserved.
+#   Copyright (C) 2007, 2008, 2012, 2017 Gregory Nutt. All rights reserved.
 #   Author: Gregory Nutt <gnutt@nuttx.org>
 #
 # Redistribution and use in source and binary forms, with or without
@@ -38,7 +38,7 @@
 ASRCS =
 CSRCS = z80_irq.c z80_timerisr.c z80_lowputc.c
 
-ifneq ($(CONFIG_DISABLE_SIGNALS),y)
+ifneq ($(CONFIG_NFILE_DESCRIPTOR),0)
 CSRCS += z80_serial.c
 endif
 
diff --git a/configs/z80sim/src/z80_serial.c b/configs/z80sim/src/z80_serial.c
index 42606643e8..a71da233f9 100644
--- a/configs/z80sim/src/z80_serial.c
+++ b/configs/z80sim/src/z80_serial.c
@@ -55,7 +55,7 @@
 #include "up_arch.h"
 #include "up_internal.h"
 
-#ifdef USE_SERIALDRIVER
+#if defined(USE_SERIALDRIVER) && CONFIG_NFILE_DESCRIPTORS > 0
 
 /****************************************************************************
  * Private Function Prototypes
@@ -335,7 +335,8 @@ void up_serialinit(void)
   (void)uart_register("/dev/console", &g_uartport);
   (void)uart_register("/dev/ttyS0", &g_uartport);
 }
-#endif /* USE_SERIALDRIVER */
+
+#endif /* USE_SERIALDRIVER && CONFIG_NFILE_DESCRIPTORS > 0 */
 
 /****************************************************************************
  * Name: up_putc