Question: Currently creating a chrome extension which sits inside other applications. Currently, the application is an ember based app and therefore has it's url changes via javascript. 

At some point this was working but I cannot get it to work any longer. Why doesn't it work?

```
        $rootScope.$watch(function(){
            return window.location;
        }, function(value){
            console.log(value)
            $rootScope.locationChanged();
        }, true)

```

Answer: 
You have to install the package "libspatialindex-dev" with the systems package manager. At least this is true with my system (Mint 17.1) which should be 100% compatible to a default Ubuntu installation.
You have to install `libspatialindex-dev` in your ubuntu system. Here i am using ubuntu 16.04 or 18.04

`sudo apt update`

`sudo apt install libspatialindex-dev`

install Rtree using your python pip version, i have pip 3.7

`pip3.7 install Rtree`

`import rtree`