+ fix linker error with MSVC

src/Mod/Drawing/Gui/TaskOrthoViews.cpp

@@ -48,6 +48,12 @@ using namespace std;
 #endif
 
 
+#if _MSC_VER <= 1500
+// maybe in the c++ standard later, older compiler don't have round()
+double round(double r) {
+    return (r > 0.0) ? floor(r + 0.5) : ceil(r - 0.5);
+}
+#endif  // _MSC_VER < 1500
 
 void pagesize(string & page_template, int dims[4], int block[4])
 {