Fixed incorrect boost version variable usage

Signed-off-by: Nick Avramoussis <[email protected]>

Author: Idclip

openvdb/openvdb/CMakeLists.txt

@@ -114,7 +114,9 @@ endif()
 
 find_package(Boost ${MINIMUM_BOOST_VERSION} REQUIRED COMPONENTS iostreams system)
 if(OPENVDB_FUTURE_DEPRECATION AND FUTURE_MINIMUM_BOOST_VERSION)
-  if(${Boost_LIB_VERSION} VERSION_LESS FUTURE_MINIMUM_BOOST_VERSION)
+  # The X.Y.Z boost version value isn't available until CMake 3.14
+  set(FULL_BOOST_VERSION "${Boost_MAJOR_VERSION}.${Boost_MINOR_VERSION}.${Boost_SUBMINOR_VERSION}")
+  if(${FULL_BOOST_VERSION} VERSION_LESS FUTURE_MINIMUM_BOOST_VERSION)
     message(DEPRECATION "Support for Boost versions < ${FUTURE_MINIMUM_BOOST_VERSION} "
       "is deprecated and will be removed.")
   endif()