diff -up VTK-6.1.0/Rendering/FreeType/vtkFreeTypeTools.cxx.type VTK-6.1.0/Rendering/FreeType/vtkFreeTypeTools.cxx
--- VTK-6.1.0/Rendering/FreeType/vtkFreeTypeTools.cxx.type	2014-01-22 08:55:41.000000000 -0700
+++ VTK-6.1.0/Rendering/FreeType/vtkFreeTypeTools.cxx	2015-01-08 15:00:40.492667074 -0700
@@ -1186,7 +1186,7 @@ bool vtkFreeTypeTools::CalculateBounding
     if (bitmap)
       {
       metaData.ascent = std::max(bitmapGlyph->top - 1, metaData.ascent);
-      metaData.descent = std::min(-(bitmap->rows - (bitmapGlyph->top - 1)),
+      metaData.descent = std::min(-(static_cast<int>(bitmap->rows) - (bitmapGlyph->top - 1)),
                                   metaData.descent);
       }
     ++heightString;
@@ -1951,8 +1951,8 @@ void vtkFreeTypeTools::GetLineMetrics(T
     if (bitmap)
       {
       bbox[0] = std::min(bbox[0], pen[0] + bitmapGlyph->left);
-      bbox[1] = std::max(bbox[1], pen[0] + bitmapGlyph->left + bitmap->width);
-      bbox[2] = std::min(bbox[2], pen[1] + bitmapGlyph->top - 1 - bitmap->rows);
+      bbox[1] = std::max(bbox[1], pen[0] + bitmapGlyph->left + static_cast<int>(bitmap->width));
+      bbox[2] = std::min(bbox[2], pen[1] + bitmapGlyph->top - 1 - static_cast<int>(bitmap->rows));
       bbox[3] = std::max(bbox[3], pen[1] + bitmapGlyph->top - 1);
       }
     else