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--- InsightToolkit-4.9.1/Modules/Segmentation/LevelSetsv4/include/itkLevelSetQuadEdgeMesh.hxx~	2016-04-12 12:51:54.000000000 -0400
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+++ InsightToolkit-4.9.1/Modules/Segmentation/LevelSetsv4/include/itkLevelSetQuadEdgeMesh.hxx	2017-07-12 23:38:31.295766730 -0400
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@@ -47,7 +47,7 @@
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 LevelSetQuadEdgeMesh< TMesh >::EvaluateGradient( const InputType& itkNotUsed(iP) ) const
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 {
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   itkWarningMacro( <<"to be implemented" );
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-  return this->GradientType();
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+  return NULL; // this->GradientType();
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 }
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 template< typename TMesh >
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@@ -55,7 +55,7 @@
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 LevelSetQuadEdgeMesh< TMesh >::EvaluateHessian( const InputType& itkNotUsed(iP) ) const
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 {
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   itkWarningMacro( <<"to be implemented" );
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-  return this->HessianType();
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+  return NULL; // this->HessianType();
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 }
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 template< typename TMesh >