libnamespaces: fix warning about syscall()

The warning was:
In file included from namespace.c:14:0:
../include/namespace.h: In function ‘setns’:
../include/namespace.h:37:2: warning: implicit declaration of function ‘syscall’ [-Wimplicit-function-declaration]

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>

diff --git a/include/namespace.h b/include/namespace.h
index a2ac7dccd0e112efbe2ec4230dccc2604f394c2a..5add9d266b7dffd5f6314516b5ecc5b2c9ab59a1 100644 (file)
--- a/include/namespace.h
+++ b/include/namespace.h
@@ -3,6 +3,7 @@
 
 #include <sched.h>
 #include <sys/mount.h>
+#include <unistd.h>
 #include <sys/syscall.h>
 #include <errno.h>