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-rw-r--r--common/rfb/SSecurityPlain.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/common/rfb/SSecurityPlain.h b/common/rfb/SSecurityPlain.h
index 610ef5bd..ecdd618b 100644
--- a/common/rfb/SSecurityPlain.h
+++ b/common/rfb/SSecurityPlain.h
@@ -20,6 +20,14 @@
#ifndef __RFB_SSECURITYPLAIN_H__
#define __RFB_SSECURITYPLAIN_H__
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#ifndef HAVE_GNUTLS
+#error "This header should not be included without HAVE_GNUTLS defined"
+#endif
+
#include <rfb/SConnection.h>
#include <rfb/SSecurity.h>
#include <rfb/SSecurityVeNCrypt.h>