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+# Installation Guide
+
+This guide is based on mac/OS with [Homebrew](https://brew.sh/) and [RVM](https://rvm.io/)
+
+## Ruby
+
+Get a correct `.ruby-version` (Can we remove it from `.gitignore`?)
+and install that version.
+
+Example with [rvm](https://rvm.io/):
+
+        rvm install 2.3.0
+
+Add the bundler gem
+
+        gem install bundler
+
+Go into your local repro and install the gems
+
+        bundle
+
+### Caveats
+
+`libv8` might cause you troubles, depending on your local configuration. If you have `libv8` installed (probably because of `node.js`) you might need to tell bundler/Rubygems to use the system version.
+
+
+        bundle config build.libv8 --with-system-v8
+        bundle
+
+or 
+        gem install libv8 -v '<version>' -- --with-system-v8
+        bundle
+
+You will get the correct value of `<version>` from bundler's error message.
+
+## Rails
+
+### Dependencies
+
+As documented [here](https://github.com/dryade/georuby-ext/issues/2) we need some more libs before we can start the `rake` setup tasks. On mac/OS the easiest way is just to install `postgis` now with `homebrew` as this will
+install all needed libraries.
+
+### Postgres
+
+#### Create user
+
+      createuser -s -U $USER -P chouette
+                  ^    ^      ^
+                  |    |      +---- prompt for passwd
+                  |    +----- as your default postgres user (remove in case of different config)
+                  +---------- superuser
+
+When promted for the password enter the highly secure string `chouette`.
+
+
+#### Create database
+
+      bundle exec rake db:migrate
+      RAILS_ENV=test bundle exec rake db:migrate
+
+#### Install node.js packages
+
+      bundle exec rake npm:install
+
+### SSO Configuration
+
+Get yourself an invitation to [Stif Portail](http://stif-portail-dev.af83.priv/) and be sure to update your information
+on your [profile page](http://stif-portail-dev.af83.priv/users/edit)  
+  
+