diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2e427ee6..c6017cfe 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -142,50 +142,54 @@ include(build/cmake/enable_audio.cmake)
 include(build/cmake/select_filesystem.cmake)
 
 
-###  Just for information:    ########################################
-include(CMakePrintHelpers)
-# see: https://cmake.org/cmake/help/v3.12/manual/cmake-properties.7.html#properties-on-targets
-cmake_print_properties(TARGETS nana  PROPERTIES
-        COMPILE_DEFINITIONS   COMPILE_OPTIONS    COMPILE_FLAGS  LINK_LIBRARIES
-        INCLUDE_DIRECTORIES   INSTALL_NAME_DIR   LINK_FLAGS     VERSION
-        )
+if (NANA_CMAKE_VERBOSE_PREPROCESSOR)
 
-        #message ("")
-# cmake_print_variables(SOURCES)
-cmake_print_variables(HEADERS)
-cmake_print_variables(PUBLIC_HEADERS)
-cmake_print_variables(NANA_CMAKE_INSTALL)
+    ###  Just for information:    ########################################
+    include(CMakePrintHelpers)
+    # see: https://cmake.org/cmake/help/v3.12/manual/cmake-properties.7.html#properties-on-targets
+    cmake_print_properties(TARGETS nana  PROPERTIES
+            COMPILE_DEFINITIONS   COMPILE_OPTIONS    COMPILE_FLAGS  LINK_LIBRARIES
+            INCLUDE_DIRECTORIES   INSTALL_NAME_DIR   LINK_FLAGS     VERSION
+            )
 
-cmake_print_variables(Boost_INCLUDE_DIR)
-cmake_print_variables(Boost_LIBRARIES)
-cmake_print_variables(Boost::filesystem)
+            #message ("")
+    # cmake_print_variables(SOURCES)
+    cmake_print_variables(HEADERS)
+    cmake_print_variables(PUBLIC_HEADERS)
+    cmake_print_variables(NANA_CMAKE_INSTALL)
 
-cmake_print_variables(PNG_INCLUDE_DIRS)
-cmake_print_variables(PNG_LIBRARIES)
-cmake_print_variables(PNG::PNG)
+    cmake_print_variables(Boost_INCLUDE_DIR)
+    cmake_print_variables(Boost_LIBRARIES)
+    cmake_print_variables(Boost::filesystem)
+
+    cmake_print_variables(PNG_INCLUDE_DIRS)
+    cmake_print_variables(PNG_LIBRARIES)
+    cmake_print_variables(PNG::PNG)
 
 
-message ( "CMAKE_CXX_COMPILER_ID     = "  ${CMAKE_CXX_COMPILER_ID})
-message ( "COMPILER_IS_CLANG         = "  ${COMPILER_IS_CLANG})
-message ( "CMAKE_COMPILER_IS_GNUCXX  = "  ${CMAKE_COMPILER_IS_GNUCXX})
-message ( "CMAKE_CXX_FLAGS           = "  ${CMAKE_CXX_FLAGS})
-message ( "CMAKE_EXE_LINKER_FLAGS    = "  ${CMAKE_EXE_LINKER_FLAGS})
-message ( "CMAKE_STATIC_LINKER_FLAGS = "  ${CMAKE_STATIC_LINKER_FLAGS})
+    message ( "CMAKE_CXX_COMPILER_ID     = "  ${CMAKE_CXX_COMPILER_ID})
+    message ( "COMPILER_IS_CLANG         = "  ${COMPILER_IS_CLANG})
+    message ( "CMAKE_COMPILER_IS_GNUCXX  = "  ${CMAKE_COMPILER_IS_GNUCXX})
+    message ( "CMAKE_CXX_FLAGS           = "  ${CMAKE_CXX_FLAGS})
+    message ( "CMAKE_EXE_LINKER_FLAGS    = "  ${CMAKE_EXE_LINKER_FLAGS})
+    message ( "CMAKE_STATIC_LINKER_FLAGS = "  ${CMAKE_STATIC_LINKER_FLAGS})
 
-message ( "DESTDIR                   = "  ${DESTDIR})
-message ( "CMAKE_INSTALL_PREFIX      = "  ${CMAKE_INSTALL_PREFIX})
-message ( "NANA_INCLUDE_DIR          = "  ${NANA_INCLUDE_DIR})
-message ( "CMAKE_CURRENT_SOURCE_DIR  = "  ${CMAKE_CURRENT_SOURCE_DIR})
-message ( "NANA_CMAKE_ENABLE_AUDIO   = "  ${NANA_CMAKE_ENABLE_AUDIO})
-message ( "NANA_CMAKE_SHARED_LIB     = "  ${NANA_CMAKE_SHARED_LIB})
-message ( "NANA_CLION              = "  ${NANA_CLION})
-message ( "CMAKE_MAKE_PROGRAM      = "  ${CMAKE_MAKE_PROGRAM})
-message ( "CMAKE_CXX_COMPILER_VERSION = " ${CMAKE_CXX_COMPILER_VERSION})
+    message ( "DESTDIR                   = "  ${DESTDIR})
+    message ( "CMAKE_INSTALL_PREFIX      = "  ${CMAKE_INSTALL_PREFIX})
+    message ( "NANA_INCLUDE_DIR          = "  ${NANA_INCLUDE_DIR})
+    message ( "CMAKE_CURRENT_SOURCE_DIR  = "  ${CMAKE_CURRENT_SOURCE_DIR})
+    message ( "NANA_CMAKE_ENABLE_AUDIO   = "  ${NANA_CMAKE_ENABLE_AUDIO})
+    message ( "NANA_CMAKE_SHARED_LIB     = "  ${NANA_CMAKE_SHARED_LIB})
+    message ( "NANA_CLION              = "  ${NANA_CLION})
+    message ( "CMAKE_MAKE_PROGRAM      = "  ${CMAKE_MAKE_PROGRAM})
+    message ( "CMAKE_CXX_COMPILER_VERSION = " ${CMAKE_CXX_COMPILER_VERSION})
 
-message ( "NANA_CMAKE_NANA_FILESYSTEM_FORCE         = "  ${NANA_CMAKE_NANA_FILESYSTEM_FORCE})
-message ( "NANA_CMAKE_FIND_BOOST_FILESYSTEM         = "  ${NANA_CMAKE_FIND_BOOST_FILESYSTEM})
-message ( "NANA_CMAKE_BOOST_FILESYSTEM_FORCE        = "  ${NANA_CMAKE_BOOST_FILESYSTEM_FORCE})
-message ( "NANA_CMAKE_BOOST_FILESYSTEM_INCLUDE_ROOT = "  ${NANA_CMAKE_BOOST_FILESYSTEM_INCLUDE_ROOT})
-message ( "NANA_CMAKE_BOOST_FILESYSTEM_LIB          = "  ${NANA_CMAKE_BOOST_FILESYSTEM_LIB})
-message ( "NANA_CMAKE_AUTOMATIC_GUI_TESTING         = "  ${NANA_CMAKE_AUTOMATIC_GUI_TESTING})
-message ( "NANA_CMAKE_ADD_DEF_AUTOMATIC_GUI_TESTING = "  ${NANA_CMAKE_ADD_DEF_AUTOMATIC_GUI_TESTING})
+    message ( "NANA_CMAKE_NANA_FILESYSTEM_FORCE         = "  ${NANA_CMAKE_NANA_FILESYSTEM_FORCE})
+    message ( "NANA_CMAKE_FIND_BOOST_FILESYSTEM         = "  ${NANA_CMAKE_FIND_BOOST_FILESYSTEM})
+    message ( "NANA_CMAKE_BOOST_FILESYSTEM_FORCE        = "  ${NANA_CMAKE_BOOST_FILESYSTEM_FORCE})
+    message ( "NANA_CMAKE_BOOST_FILESYSTEM_INCLUDE_ROOT = "  ${NANA_CMAKE_BOOST_FILESYSTEM_INCLUDE_ROOT})
+    message ( "NANA_CMAKE_BOOST_FILESYSTEM_LIB          = "  ${NANA_CMAKE_BOOST_FILESYSTEM_LIB})
+    message ( "NANA_CMAKE_AUTOMATIC_GUI_TESTING         = "  ${NANA_CMAKE_AUTOMATIC_GUI_TESTING})
+    message ( "NANA_CMAKE_ADD_DEF_AUTOMATIC_GUI_TESTING = "  ${NANA_CMAKE_ADD_DEF_AUTOMATIC_GUI_TESTING})
+
+endif()
\ No newline at end of file