diff --git a/CMakeLists.txt b/CMakeLists.txt
index 76db7ba..885eeda 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,8 +9,8 @@ project(ThDy_DNAHybrid VERSION      0.02.00
 add_executable(   ThDy_DNAHybrid)
 
 target_include_directories(ThDy_DNAHybrid PUBLIC include)
-target_compile_features   (ThDy_DNAHybrid PUBLIC cxx_std_17)
-target_sources            (ThDy_DNAHybrid PRIVATE
+#target_compile_features   (ThDy_DNAHybrid PUBLIC cxx_std_17)
+target_sources (ThDy_DNAHybrid PRIVATE
         src/ThDySec/cod_deg.cpp
         src/ThDySec/sec.cpp
         src/ThDySec/sec_basic.cpp
@@ -35,7 +35,8 @@ target_sources            (ThDy_DNAHybrid PRIVATE
         src/ThDy_DNAHybrid.Nana/uArray.cpp)
 
 
-add_subdirectory(../ExtLib/nana.ext  ../ExtLib/cmake-nana_ext-build-${CMAKE_BUILD_TYPE} )
+add_subdirectory(../ExtLib/nana.ext  ../ExtLib/cmake-nana_ext-build-${CMAKE_BUILD_TYPE}
+                 EXCLUDE_FROM_ALL )
 target_link_libraries(ThDy_DNAHybrid PRIVATE nana_ext )