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--- xen-4.5.1/tools/qemu-xen-traditional/vnc.c.orig	2015-07-12 21:55:32.875504811 +0100
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+++ xen-4.5.1/tools/qemu-xen-traditional/vnc.c	2015-07-12 22:03:03.860005391 +0100
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@@ -2140,7 +2140,7 @@
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 static int vnc_set_gnutls_priority(gnutls_session_t s, int x509)
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 {
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-    const char *priority = x509 ? "NORMAL" : "NORMAL:+ANON-DH";
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+    const char *priority = x509 ? "@SYSTEM" : "@SYSTEM:+ANON-DH";
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     int rc;
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     rc = gnutls_priority_set_direct(s, priority, NULL);