Index: pam-1.7.0/modules/pam_xauth/pam_xauth.c
===================================================================
--- pam-1.7.0.orig/modules/pam_xauth/pam_xauth.c
+++ pam-1.7.0/modules/pam_xauth/pam_xauth.c
@@ -67,6 +67,10 @@
 #include "pam_cc_compat.h"
 #include "pam_inline.h"
 
+#ifndef HOST_NAME_MAX
+#define HOST_NAME_MAX 1024
+#endif
+
 #define DATANAME "pam_xauth_cookie_file"
 #define XAUTHENV "XAUTHORITY"
 #define HOMEENV  "HOME"
