attach: fix missing pthread.h include

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

diff --git a/src/lxc/attach.c b/src/lxc/attach.c
index e46d742c55c049fdb8bf15a8c6b8bcca7f92643f..9464d882e3aaa5b508d41f9038836e346ceb9d50 100644 (file)
--- a/src/lxc/attach.c
+++ b/src/lxc/attach.c
@@ -29,6 +29,7 @@
 #include <grp.h>
 #include <linux/unistd.h>
 #include <pwd.h>
+#include <pthread.h>
 #include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>