diff --git a/configure b/configure
index 284ae5b9d8..f2978cb345 100755
--- a/configure
+++ b/configure
@@ -42122,7 +42122,7 @@ fi
 
 if test "$GCC" = "yes" ; then
     if test "$wxUSE_NO_RTTI" = "yes" ; then
-        WXCONFIG_CXXFLAGS="$WXCONFIG_CXXFLAGS -fno-rtti"
+                                WXCONFIG_CXXFLAGS="$WXCONFIG_CXXFLAGS -DwxNO_RTTI -fno-rtti"
     fi
     if test "$wxUSE_NO_EXCEPTIONS" = "yes" ; then
         WXCONFIG_CXXFLAGS="$WXCONFIG_CXXFLAGS -fno-exceptions"
@@ -47507,7 +47507,7 @@ cat confdefs.h >>conftest.$ac_ext
 cat >>conftest.$ac_ext <<_ACEOF
 /* end confdefs.h.  */
 #include <windows.h>
-#include <gdiplus.h>
+                     #include <gdiplus.h>
 int
 main ()
 {
diff --git a/configure.in b/configure.in
index e6bf454aef..70aa4f4e09 100644
--- a/configure.in
+++ b/configure.in
@@ -5408,7 +5408,10 @@ fi
 
 if test "$GCC" = "yes" ; then
     if test "$wxUSE_NO_RTTI" = "yes" ; then
-        WXCONFIG_CXXFLAGS="$WXCONFIG_CXXFLAGS -fno-rtti"
+        dnl Define wxNO_RTTI on the command line because only g++ 4.3 and later
+        dnl define __GXX_RTTI which allows us to detect the use of -fno-rtti
+        dnl switch but we need to do it manually for the older versions.
+        WXCONFIG_CXXFLAGS="$WXCONFIG_CXXFLAGS -DwxNO_RTTI -fno-rtti"
     fi
     if test "$wxUSE_NO_EXCEPTIONS" = "yes" ; then
         WXCONFIG_CXXFLAGS="$WXCONFIG_CXXFLAGS -fno-exceptions"
diff --git a/include/wx/platform.h b/include/wx/platform.h
index dd343949e5..713925585f 100644
--- a/include/wx/platform.h
+++ b/include/wx/platform.h
@@ -837,7 +837,11 @@
     g++) or by editing project files with MSVC so test for it here too.
  */
 #ifndef wxNO_RTTI
-#   ifdef __GNUG__
+    /*
+        Only 4.3 defines __GXX_RTTI by default so its absence is not an
+        indication of disabled RTTI with the previous versions.
+     */
+#   if wxCHECK_GCC_VERSION(4, 3)
 #       ifndef __GXX_RTTI
 #           define wxNO_RTTI
 #       endif