frontends/fltk_gui/CsoundGUIMain.cpp fails to build because of change 
introduced in commit 1.22. The following change makes it build: 

diff --git a/frontends/fltk_gui/CsoundGUIMain.cpp 
b/frontends/fltk_gui/CsoundGUI
index eed0398..4245f22 100644
--- a/frontends/fltk_gui/CsoundGUIMain.cpp
+++ b/frontends/fltk_gui/CsoundGUIMain.cpp
@@ -631,7 +631,7 @@ void CsoundGUIMain::runHelpBrowser(string page)
       }
     }
     else {
-      string label = "Manual file not found\n" + cmd.c_str();
+      string label = "Manual file not found\n" + cmd;
       fl_alert(label.c_str());
     }
 }

Also, current cvs is failing to build with gcc 4.3. The attached patch fixes 
the issue.

-- 
Felipe Sateler