(ws) #125 / cmake detects an already installed jsoncpp and will try to use this one if present

ws/CMakeLists.txt

@@ -29,10 +29,16 @@ if (UNIX)
   set( STATSD_CLIENT_SOURCES ../third_party/statsd-client-cpp/src/statsd_client.cpp)
 endif()
 
+find_package(JsonCpp)
+if (NOT JSONCPP_FOUND)
+  include_directories(../third_party/jsoncpp)
+  set(JSONCPP_SOURCES ../third_party/jsoncpp/jsoncpp.cpp)
+endif()
+
 add_executable(ws 
   ../third_party/msgpack11/msgpack11.cpp
-  ../third_party/jsoncpp/jsoncpp.cpp
   ${STATSD_CLIENT_SOURCES}
+  ${JSONCPP_SOURCES}
 
   ws_http_client.cpp
   ws_ping_pong.cpp
@@ -74,4 +80,9 @@ if(NOT APPLE AND NOT USE_MBED_TLS)
   target_link_libraries(ws ${OPENSSL_LIBRARIES})
 endif()
 
+if (JSONCPP_FOUND)
+  target_include_directories(ws PUBLIC ${JSONCPP_INCLUDE_DIRS})
+  target_link_libraries(ws ${JSONCPP_LIBRARIES})
+endif()
+
 install(TARGETS ws RUNTIME DESTINATION bin)