...

diff --git a/lib/ivq/ITK/FourierSeries.cxx b/lib/ivq/ITK/FourierSeries.cxx
index 81f4317..47384f0 100644 (file)
--- a/lib/ivq/ITK/FourierSeries.cxx
+++ b/lib/ivq/ITK/FourierSeries.cxx
@@ -689,7 +689,7 @@ _DFT( const std::vector< TComplex >& p, unsigned int q )
   // Minimize phase
   struct _TComplexCmp
   {
-    bool operator()( const TComplex& a, const TComplex& b )
+    bool operator()( const TComplex& a, const TComplex& b ) const
       {
         return(
           ( std::real( b ) < std::real( a ) ) &&