Merge remote-tracking branch 'upstream/pull/3453'

diff --combined INSTALL.md
index b78b4c4b66414a3ad9aab503291c29d725bbf34f,2f41b7c64d81311338719b62b7f918d0dbcb1d60..68b0d120eed37af098e356d3b4b08fe8fa8cfa6e
--- 1/INSTALL.md
--- 2/INSTALL.md
+++ b/INSTALL.md
@@@ -90,7 -90,7 +90,7 @@@ Installing other dependencies
  
  * Install Homebrew from https://brew.sh/
  * Install the latest version of Ruby: `brew install ruby`
- * Install other dependencies: `brew install imagemagick libxml2 gd yarn pngcrush optipng pngquant jhead jpegoptim gifsicle svgo`
+ * Install other dependencies: `brew install imagemagick libxml2 gd yarn pngcrush optipng pngquant jhead jpegoptim gifsicle svgo advancecomp`
  * Install Bundler: `gem install bundler` (you might need to `sudo gem install bundler` if you get an error about permissions - or see note below about [developer Ruby setup](#rbenv))
  
  You will need to tell `bundler` that `libxml2` is installed in a Homebrew location. If it uses the system-installed one then you will get errors installing the `libxml-ruby` gem later on<a name="macosx-bundle-config"></a>.
@@@ -102,7 -102,8 +102,7 @@@ bundle config build.libxml-ruby --with-
  If you want to run the tests, you need `geckodriver` as well:
  
  ```
 -brew tap homebrew/cask
 -brew cask install geckodriver
 +brew install geckodriver
  ```
  
  Note that OS X does not have a /home directory by default, so if you are using the GPX functions, you will need to change the directories specified in config/application.yml.