Add the OpenSSL libvncclient TLS version to the build system.

libvncclient/Makefile.am

 INCLUDES = -I$(top_srcdir) -I$(top_srcdir)/common
 
-libvncclient_la_SOURCES=cursor.c listen.c rfbproto.c sockets.c vncviewer.c ../common/minilzo.c tls.c
+if HAVE_GNUTLS
+TLSSRCS = tls_gnutls.c
+TLSLIBS = @GNUTLS_LIBS@
+else
+if HAVE_LIBSSL
+TLSSRCS = tls_openssl.c 
+TLSLIBS = @SSL_LIBS@ @CRYPT_LIBS@
+else
+TLSSRCS = tls_none.c
+endif
+endif
+
+
+libvncclient_la_SOURCES=cursor.c listen.c rfbproto.c sockets.c vncviewer.c ../common/minilzo.c $(TLSSRCS)
+libvncclient_la_LIBADD=$(TLSLIBS)
 
 noinst_HEADERS=../common/lzodefs.h ../common/lzoconf.h ../common/minilzo.h tls.h
 

libvncclient/tls_none.c

+/*
+ *  Copyright (C) 2012 Christian Beier.
+ *
+ *  This is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This software is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this software; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ *  USA.
+ */
+
+#include "tls.h"
+
+rfbBool HandleAnonTLSAuth(rfbClient* client) 
+{
+  rfbClientLog("TLS is not supported.\n");
+  return FALSE;
+}
+
+
+rfbBool HandleVeNCryptAuth(rfbClient* client)
+{
+  rfbClientLog("TLS is not supported.\n");
+  return FALSE;
+}
+
+
+int ReadFromTLS(rfbClient* client, char *out, unsigned int n)
+{
+  rfbClientLog("TLS is not supported.\n");
+  errno = EINTR;
+  return -1;
+}
+
+
+int WriteToTLS(rfbClient* client, char *buf, unsigned int n)
+{
+  rfbClientLog("TLS is not supported.\n");
+  errno = EINTR;
+  return -1;
+}
+
+
+void FreeTLS(rfbClient* client)
+{
+
+}
+