From 3df48bdde96632a83cacff1f7795837a160de1d4 Mon Sep 17 00:00:00 2001
From: Johannes Schindelin <johannes.schindelin@gmx.de>
Date: Fri, 14 Jul 2017 16:11:43 +0200
Subject: [PATCH] copyfd: guard use of munmap() with #if (windows builds need
 this)

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---
 libbb/copyfd.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libbb/copyfd.c b/libbb/copyfd.c
index 7e3531903..921fe3f81 100644
--- a/libbb/copyfd.c
+++ b/libbb/copyfd.c
@@ -119,8 +119,11 @@ static off_t bb_full_fd_action(int src_fd, int dst_fd, off_t size)
 	}
  out:
 
+/* some environments don't have munmap(), hide it in #if */
+#if CONFIG_FEATURE_COPYBUF_KB > 4
 	if (buffer_size > 4 * 1024)
 		munmap(buffer, buffer_size);
+#endif
 	return status ? -1 : total;
 }