diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4500831..ffbfa8e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -97,7 +97,7 @@ MESSAGE( STATUS "CMAKE_CXX_COMPILER: " ${CMAKE_CXX_COMPILER} )
 ######## for python module
 find_package(PythonInterp)
 if(PYTHONINTERP_FOUND)
-    message("-- Python found: ${PYTHON_EXECUTABLE}")
+    message(STATUS "Python found: ${PYTHON_EXECUTABLE}")
 endif()
 if(PYTHON_MODULE)
     if(NOT PYTHONINTERP_FOUND)
diff --git a/bin/CMakeLists.txt b/bin/CMakeLists.txt
index 3ef4f79..4f5d857 100644
--- a/bin/CMakeLists.txt
+++ b/bin/CMakeLists.txt
@@ -1,21 +1,28 @@
 set(CATIMA_APPS catima_calculator)
+
+find_package(nlohmann_json QUIET)
+
+if(nlohmann_json_FOUND)
+MESSAGE(STATUS "system nlohmann_json found ")
+else(nlohmann_json_FOUND)
+#MESSAGE(STATUS "nlohmann_json looking ")
 include(ExternalProject)
 ExternalProject_Add(
 	json_hpp
-	URL https://raw.githubusercontent.com/nlohmann/json/develop/single_include/nlohmann/json.hpp
-	DOWNLOAD_NO_EXTRACT 1
-	DOWNLOAD_NO_PROGRESS 
+	URL https://github.com/nlohmann/json/releases/download/v3.9.1/include.zip	
 	CONFIGURE_COMMAND ""
 	BUILD_COMMAND ""
 	INSTALL_COMMAND ""
 	PREFIX "external"
 	)
-ExternalProject_Get_Property(json_hpp download_dir)
+ExternalProject_Get_Property(json_hpp SOURCE_DIR)
+endif(nlohmann_json_FOUND)
 
 foreach(entry ${CATIMA_APPS})
     add_executable(${entry} ${entry}.cpp)
-    target_link_libraries(${entry} catima)
-    target_include_directories(${entry} PRIVATE ${download_dir})
+    target_link_libraries(${entry} catima )
+	#target_link_libraries(${entry} PRIVATE nlohmann_json::nlohmann_json)
+	target_include_directories(${entry} PRIVATE ${SOURCE_DIR}/include) 
 endforeach(entry in ${CATIMA_APPS})
 
 install (TARGETS ${CATIMA_APPS} RUNTIME DESTINATION bin)
diff --git a/bin/catima_calculator.cpp b/bin/catima_calculator.cpp
index 388ca64..2b4d482 100644
--- a/bin/catima_calculator.cpp
+++ b/bin/catima_calculator.cpp
@@ -8,7 +8,7 @@
 #include <stdexcept>
 #include "catima/catima.h"
 #include "catima/nucdata.h"
-#include "json.hpp"
+#include <nlohmann/json.hpp>
 
 using namespace std;
 using namespace catima;