-static-libgcc ?

build/cmake/shared_libs.cmake

@@ -40,7 +40,7 @@ if(CMAKE_COMPILER_IS_GNUCXX OR "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang") #  AN
     if(BUILD_SHARED_LIBS)
         target_compile_options(nana PUBLIC  -lgcc -lstdc++)
     else()
-        target_link_libraries(nana PUBLIC -static -static-libstdc++)
+        target_link_libraries(nana PUBLIC  -static-libgcc -static-libstdc++)
     endif(BUILD_SHARED_LIBS)
 
 endif()

include/nana/gui/widgets/group.hpp

@@ -100,6 +100,10 @@ namespace nana{
 		group& enable_format_caption(bool format);
 
 		group& collocate() noexcept;
+
+		/// this will set the `usr_div_str` for an internal field, called the "user field".
+		/// The "full" `place` of a `group` widget is internally divided into a field for the title,
+		/// a field for the added "options" and a field for "user" widgets.
 		group& div(const char* div_str) noexcept;
 		field_reference operator[](const char* field);