fix link if system json lib exists

cmake/Modules/FindJson.cmake

@@ -2,17 +2,17 @@
 
 #FIND_PATH(JSON_INCLUDE_DIR json.h)
 
-#FIND_LIBRARY(JSON_LIBRARY NAMES json)
+#FIND_LIBRARY(JSON_LIBRARY NAMES jsoncpp)
 
 #IF(JSON_LIBRARY AND JSON_INCLUDE_DIR)
 #	SET( JSON_FOUND TRUE )
 #ENDIF(JSON_LIBRARY AND JSON_INCLUDE_DIR)
 
 #IF(JSON_FOUND)
-#	MESSAGE(STATUS "Found system json header file in ${JSON_INCLUDE_DIR}")
-#	MESSAGE(STATUS "Found system json library ${JSON_LIBRARY}")
+#	MESSAGE(STATUS "Found system jsoncpp header file in ${JSON_INCLUDE_DIR}")
+#	MESSAGE(STATUS "Found system jsoncpp library ${JSON_LIBRARY}")
 #ELSE(JSON_FOUND)
 	SET(JSON_INCLUDE_DIR ${PROJECT_SOURCE_DIR}/json)
-	SET(JSON_LIBRARY json)
-	MESSAGE(STATUS "Using project json library")
+	SET(JSON_LIBRARY jsoncpp)
+	MESSAGE(STATUS "Using project jsoncpp library")
 #ENDIF(JSON_FOUND)

src/json/CMakeLists.txt

@@ -6,9 +6,9 @@ else( UNIX )
 	set(json_platform_LIBS "")
 endif( UNIX )
 
-add_library(json ${json_SRCS})
+add_library(jsoncpp ${json_SRCS})
 
 target_link_libraries(
-	json
+	jsoncpp
 	${json_platform_LIBS}
 )