-\twocolitem{\_\_GNUG\_\_}{Gnu C++ on any platform}
-\twocolitem{\_\_GNUWIN32\_\_}{Gnu-Win32 compiler}
+\twocolitem{\_\_GNUG\_\_}{Gnu C++ on any platform, see also
+\helpref{wxCHECK\_GCC\_VERSION}{wxcheckgccversion}}
+\twocolitem{\_\_GNUWIN32\_\_}{Gnu-Win32 compiler, see also
+\helpref{wxCHECK\_W32API\_VERSION}{wxcheckw32apiversion}}