Make use of GnuTLS an explicit choice to avoid surprises if it gets included

or not.


git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4455 3789f03b-4d11-0410-bbf8-ca57d06f2519

CMakeLists.txt

@@ -208,8 +208,10 @@ if(BUILD_NEW_VNCVIEWER)
 endif()
 
 # Check for GNUTLS library
-find_package(GnuTLS)
-if(GNUTLS_FOUND)
+option(ENABLE_GNUTLS "Enable protocol encryption and advanced authentication")
+if(ENABLE_GNUTLS)
+  find_package(GnuTLS REQUIRED)
+
   include_directories(${GNUTLS_INCLUDE_DIR})
   add_definitions("-DHAVE_GNUTLS")
   add_definitions(${GNUTLS_DEFINITIONS})