diff --git a/CMakeLists.txt b/CMakeLists.txt
index 69e1de1d..a7d0167a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,7 +22,7 @@
 # cmake 3.12 have more better modern c++ support
 
 cmake_minimum_required(VERSION 3.12  FATAL_ERROR)
-project(nana VERSION      1.7.1
+project(nana VERSION      1.7.2
         DESCRIPTION "C++ GUI library"
         HOMEPAGE_URL http://nanapro.org
         LANGUAGES CXX         )
@@ -116,7 +116,7 @@ option(NANA_CMAKE_ENABLE_MINGW_STD_THREADS_WITH_MEGANZ "replaced boost.thread wi
 
 ######## Nana options
 
-target_compile_definitions(nana PRIVATE NANA_IGNORE_CONF)    # really ?
+target_compile_definitions(nana PRIVATE NANA_IGNORE_CONF)    # really ??
 if(NANA_CMAKE_AUTOMATIC_GUI_TESTING)
     target_compile_definitions(nana PUBLIC NANA_AUTOMATIC_GUI_TESTING)
     # todo: enable_testing()       #  ??
diff --git a/build/cmake/select_filesystem.cmake b/build/cmake/select_filesystem.cmake
index 7b2163de..3ae20e8f 100644
--- a/build/cmake/select_filesystem.cmake
+++ b/build/cmake/select_filesystem.cmake
@@ -1,15 +1,13 @@
 # The ISO C++ File System Technical Specification (ISO-TS, or STD) was optional.
 #              http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4100.pdf
 # It is part of c++17.
-# The library may be not available or working correctly in the std library in use. As a workaround we may try
+# The library may be not available or working correctly in the std library you use. As a workaround we may try
 # to "implement" it (ab)using Boost (almost compatible)
 #              http://www.boost.org/doc/libs/1_60_0/libs/filesystem/doc/index.htm
 # or you can choose to use the (partial, but functional) implementation provided by nana.
 # If you include the file <nana/filesystem/filesystem.hpp> or <nana/filesystem/filesystem_ext.hpp>
-# the selected option will be set by nana into std::filesystem
-# By default Nana will try to use the STD. If STD is not available and NANA_CMAKE_FIND_BOOST_FILESYSTEM
-# is set to ON nana will try to use boost if available. Nana own implementation will be use if none of
-# the previus were selected or available.
+# the selected option will be inlined by nana into std::filesystem
+# By default Nana will try to use the STD. If STD is not available Nana own implementation will be used.
 # You can change that default if you change one of the following
 # (please don't define more than one of the _XX_FORCE options):
 option(NANA_CMAKE_NANA_FILESYSTEM_FORCE "Force nana filesystem over ISO and boost?" OFF)
@@ -18,13 +16,20 @@ option(NANA_CMAKE_BOOST_FILESYSTEM_FORCE "Force use of Boost filesystem if avail
 option(NANA_CMAKE_FIND_BOOST_FILESYSTEM "Search: Is Boost filesystem available?" OFF)
 
 if(NANA_CMAKE_NANA_FILESYSTEM_FORCE)
+    if(NANA_CMAKE_STD_FILESYSTEM_FORCE)
+        message (FATAL_ERROR "Defined NANA_CMAKE_NANA_FILESYSTEM_FORCE and NANA_CMAKE_STD_FILESYSTEM_FORCE")
+    endif()
+    if(NANA_CMAKE_BOOST_FILESYSTEM_FORCE)
+        message (FATAL_ERROR "Defined NANA_CMAKE_NANA_FILESYSTEM_FORCE and NANA_CMAKE_BOOST_FILESYSTEM_FORCE")
+    endif()
+
     target_compile_definitions(nana PUBLIC NANA_FILESYSTEM_FORCE)
 
-elseif(NANA_CMAKE_STD_FILESYSTEM_FORCE)
-    target_compile_definitions(nana PUBLIC STD_FILESYSTEM_FORCE)
-    target_link_libraries     (nana PUBLIC stdc++fs)
-
 elseif(NANA_CMAKE_BOOST_FILESYSTEM_FORCE)
+    if(NANA_CMAKE_STD_FILESYSTEM_FORCE)
+        message (FATAL_ERROR "Defined NANA_CMAKE_BOOST_FILESYSTEM_FORCE and NANA_CMAKE_STD_FILESYSTEM_FORCE")
+    endif()
+
     target_compile_definitions(nana PUBLIC BOOST_FILESYSTEM_FORCE)
     # https://cmake.org/cmake/help/git-master/module/FindBoost.html
     # Implicit dependencies such as Boost::filesystem requiring Boost::system will be automatically detected and satisfied,
@@ -51,6 +56,3 @@ else()
 endif()
 
 
-
-
-