Fixes the CMake file.

Author: mzimbres

example/CMakeLists.txt

@@ -10,8 +10,8 @@ macro(make_example EXAMPLE_NAME STANDARD)
   if (${STANDARD} STREQUAL "20")
     target_link_libraries(${EXAMPLE_NAME} PRIVATE examples_main)
   endif()
-  if (${STANDARD} STREQUAL "20")
-    target_link_libraries(${EXAMPLE_NAME} PRIVATE Boost::json)
+  if (${EXAMPLE_NAME} STREQUAL "cpp20_json")
+    target_link_libraries(${EXAMPLE_NAME} PRIVATE Boost::json Boost::container_hash)
   endif()
 endmacro()