--- webkitgtk-2.46.5.old/Source/WebCore/rendering/RenderBox.h
+++ webkitgtk-2.46.5/Source/WebCore/rendering/RenderBox.h
@@ -707,7 +707,7 @@
 
     void computePreferredLogicalWidths(const Length& minWidth, const Length& maxWidth, LayoutUnit borderAndPadding);
     
-    bool isAspectRatioDegenerate(double aspectRatio) const { return !aspectRatio || isnan(aspectRatio); }
+    bool isAspectRatioDegenerate(double aspectRatio) const { return !aspectRatio || std::isnan(aspectRatio); }
     
 private:
     bool replacedMinMaxLogicalHeightComputesAsNone(SizeType) const;
--- webkitgtk-2.46.5.old/Source/WebCore/rendering/shapes/ShapeOutsideInfo.cpp
+++ webkitgtk-2.46.5/Source/WebCore/rendering/shapes/ShapeOutsideInfo.cpp
@@ -133,7 +133,7 @@
 
     auto margin = [&] {
         auto shapeMargin = floatValueForLength(style.shapeMargin(), containingBlock.contentWidth());
-        return isnan(shapeMargin) ? 0.0f : shapeMargin;
+        return std::isnan(shapeMargin) ? 0.0f : shapeMargin;
     }();