Actualización

app/Resources/public/assets/modernizr/feature-detects/css-vhunit.js

@@ -0,0 +1,14 @@
+// https://github.com/Modernizr/Modernizr/issues/572
+// Similar to http://jsfiddle.net/FWeinb/etnYC/
+Modernizr.addTest('cssvhunit', function() {
+    var bool;
+    Modernizr.testStyles("#modernizr { height: 50vh; }", function(elem, rule) {   
+        var height = parseInt(window.innerHeight/2,10),
+            compStyle = parseInt((window.getComputedStyle ?
+                      getComputedStyle(elem, null) :
+                      elem.currentStyle)["height"],10);
+        
+        bool= (compStyle == height);
+    });
+    return bool;
+});