diff -urp mathgl-2.4.1/examples/wx_example.cpp mathgl-2.4.1-gcc7/examples/wx_example.cpp
--- mathgl-2.4.1/examples/wx_example.cpp	2017-12-05 12:02:01.771791180 +0700
+++ mathgl-2.4.1-gcc7/examples/wx_example.cpp	2017-12-05 15:41:42.622938431 +0700
@@ -53,7 +53,7 @@ IMPLEMENT_APP(testApp)
 //-----------------------------------------------------------------------------
 bool testApp::OnInit()
 {
-	testFrame* frame = new testFrame(0L, _("MathGL + wxWidgets sample"));
+	testFrame* frame = new testFrame(0L,  wxString(_("MathGL + wxWidgets sample")));
 	frame->Show();
 	return true;
 }
@@ -68,8 +68,8 @@ testFrame::testFrame(wxFrame *frame, con
 	// create a menu bar
 	wxMenuBar* mbar = new wxMenuBar();
 	wxMenu* fileMenu = new wxMenu(_T(""));
-	fileMenu->Append(idMenuQuit, _("&Quit\tAlt-F4"), _("Quit the application"));
-	mbar->Append(fileMenu, _("&File"));
+	fileMenu->Append(idMenuQuit,  wxString(_("&Quit\tAlt-F4")),  wxString(_("Quit the application")));
+	mbar->Append(fileMenu,  wxString(_("&File")));
 	SetMenuBar(mbar);
 	SetSize(800,620);