diff -Naur mahogany-0.67.cvs/include/gui/wxMApp.h mahogany-0.67.utf8warn/include/gui/wxMApp.h
--- mahogany-0.67.cvs/include/gui/wxMApp.h	2006-09-04 20:27:35.000000000 +0200
+++ mahogany-0.67.utf8warn/include/gui/wxMApp.h	2006-09-04 20:22:24.000000000 +0200
@@ -81,6 +81,8 @@
    virtual bool CanClose() const;
    virtual void OnClose();
 
+   wxFontEncoding GetSystemEncoding_Workaround();
+
    // wxWin calls these functions to start/run/stop the application
    virtual bool OnInit();
    virtual int  OnRun();
diff -Naur mahogany-0.67.cvs/src/gui/wxMApp.cpp mahogany-0.67.utf8warn/src/gui/wxMApp.cpp
--- mahogany-0.67.cvs/src/gui/wxMApp.cpp	2006-09-04 20:27:41.000000000 +0200
+++ mahogany-0.67.utf8warn/src/gui/wxMApp.cpp	2006-09-04 20:22:36.000000000 +0200
@@ -909,6 +909,39 @@
 #endif // 0
 }
 
+wxFontEncoding wxMApp::GetSystemEncoding_Workaround()
+{
+    const wxString encname = wxLocale::GetSystemEncodingName();
+    if ( !encname.empty() )
+    {
+        wxFontEncoding enc = wxFontMapperBase::GetEncodingFromName(encname);
+
+        // on some modern Linux systems (RedHat 8) the default system locale
+        // is UTF8 -- but it isn't supported by wxGTK1 in ANSI build at all so
+        // don't even try to use it in this case
+#if !wxUSE_UNICODE && \
+        ((defined(__WXGTK__) && !defined(__WXGTK20__)) || defined(__WXMOTIF__))
+        if ( enc == wxFONTENCODING_UTF8 )
+        {
+            // the most similar supported encoding...
+            enc = wxFONTENCODING_ISO8859_1;
+        }
+#endif // !wxUSE_UNICODE
+
+        // GetEncodingFromName() returns wxFONTENCODING_DEFAULT for C locale
+        // (a.k.a. US-ASCII) which is arguably a bug but keep it like this for
+        // backwards compatibility and just take care to not return
+        // wxFONTENCODING_DEFAULT from here as this surely doesn't make sense
+        if ( enc != wxFONTENCODING_MAX && enc != wxFONTENCODING_DEFAULT )
+        {
+            return enc;
+        }
+        //else: return wxFONTENCODING_SYSTEM below
+    }
+
+    return wxFONTENCODING_SYSTEM;
+}
+
 // app initilization
 bool
 wxMApp::OnInit()
@@ -1102,12 +1135,10 @@
    }
 #endif // USE_I18N
 
-   // wxLocale::GetSystemEncoding() is broken in wx <= 2.6.3, it returns
-   // ISO-8859-1 for UTF-8 locale
-#if defined(__WXGTK20__) && wxCHECK_VERSION(2, 6, 4)
+#ifdef __WXGTK20__
    // we need UTF-8 support to be able to work with messages in different
    // encodings
-   if ( wxLocale::GetSystemEncoding() != wxFONTENCODING_UTF8 )
+   if ( GetSystemEncoding_Workaround() != wxFONTENCODING_UTF8 )
    {
       // TODO: set encoding to UTF-8 (but keeping the current language)
       //       ourselves