The answer to all of your compiling problems. But your problem is there is either no skybox that you are supposed to make btw, or you have one but it isnt sealed. (sealed I mean all brushes that the skybox is made up of touch and seal the map inside the "box"), ooorrrrr you have an entity/brush/spawnpoint/lightsource anything really. put side the skybox.
Everything else can be found here. Just look it up.
http://dynamic4.gamespy.com/%7Emap/moha ... 603329b0e3