--- webkitgtk-2.48.1.old/Source/WebCore/rendering/RenderBox.h
+++ webkitgtk-2.48.1/Source/WebCore/rendering/RenderBox.h
@@ -698,7 +698,7 @@
 
     void computePreferredLogicalWidths(const Length& minLogicalWidth, const Length& maxLogicalWidth, LayoutUnit borderAndPaddingLogicalWidth);
     
-    bool isAspectRatioDegenerate(double aspectRatio) const { return !aspectRatio || isnan(aspectRatio); }
+    bool isAspectRatioDegenerate(double aspectRatio) const { return !aspectRatio || std::isnan(aspectRatio); }
 
     bool overflowChangesMayAffectLayout() const final;
 
--- webkitgtk-2.48.1.old/Source/WebCore/rendering/shapes/ShapeOutsideInfo.cpp
+++ webkitgtk-2.48.1/Source/WebCore/rendering/shapes/ShapeOutsideInfo.cpp
@@ -137,7 +137,7 @@
 
     auto margin = [&] {
         auto shapeMargin = floatValueForLength(style.shapeMargin(), containingBlock.contentBoxWidth());
-        return isnan(shapeMargin) ? 0.0f : shapeMargin;
+        return std::isnan(shapeMargin) ? 0.0f : shapeMargin;
     }();