1 files changed, 12 insertions, 0 deletions
diff --git a/starmath/inc/symbol.hxx b/starmath/inc/symbol.hxx
index 503859485095..51e8ad0b8642 100644
--- a/starmath/inc/symbol.hxx
+++ b/starmath/inc/symbol.hxx
@@ -38,7 +38,10 @@
 #include <map>
 #include <vector>
 #include <set>
+#include <functional>
+#include <algorithm>
 
+#include "unomodel.hxx"
 #include "utility.hxx"
 #include "smmod.hxx"
 
@@ -133,6 +136,15 @@ typedef std::map< String, SmSym, lt_String >    SymbolMap_t;
 // vector of pointers to the actual symbols in the above container
 typedef std::vector< const SmSym * >            SymbolPtrVec_t;
 
+struct lt_SmSymPtr : public std::binary_function< const SmSym *, const SmSym *, bool >
+{
+    bool operator() ( const SmSym *pSym1, const SmSym *pSym2 )
+    {
+        return pSym1->GetCharacter() < pSym2->GetCharacter();
+    }
+};
+
+
 class SmSymbolManager : public SfxListener
 {
     SymbolMap_t         m_aSymbols;