[ci skip] Add ImageMagick to ActiveStorage dependencies

In order to run ActiveStorage's tests successfully, you need
imagemagick.

1 files changed, 13 insertions, 1 deletions

diff --git a/guides/source/development_dependencies_install.md b/guides/source/development_dependencies_install.md
index 439797ddcb..a56a78e4f8 100644
--- a/guides/source/development_dependencies_install.md
+++ b/guides/source/development_dependencies_install.md
@@ -378,7 +378,7 @@ $ yarn install
 ```
 
 Extracting previews, tested in Active Storage's test suite requires third-party
-applications, FFmpeg for video and muPDF for PDFs, and on macOS also XQuartz
+applications, ImageMagick for images, FFmpeg for video and muPDF for PDFs, and on macOS also XQuartz
 and Poppler. Without these applications installed, Active Storage tests will
 raise errors.
 
@@ -386,6 +386,7 @@ On macOS you can run:
 
 ```bash
 $ brew install ffmpeg
+$ brew install imagemagick
 $ brew cask install xquartz
 $ brew install mupdf-tools
 $ brew install poppler
@@ -396,6 +397,7 @@ On Ubuntu, you can run:
 ```bash
 $ sudo apt-get update
 $ sudo apt-get install ffmpeg
+$ sudo apt-get install imagemagick
 $ sudo apt-get install mupdf mupdf-tools
 ```
 
@@ -403,12 +405,22 @@ On Fedora or CentOS, just run:
 
 ```bash
 $ sudo yum install ffmpeg
+$ sudo yum install imagemagick
 $ sudo yum install mupdf
 ```
 
 FreeBSD users can just run:
 
 ```bash
+# pkg install imagemagick
 # pkg install ffmpeg
 # pkg install mupdf
 ```
+
+On Arch Linux, you can run:
+```bash
+$ sudo pacman -S ffmpeg
+$ sudo pacman -S imagemagick
+$ sudo pacman -S mupdf mupdf-tools
+$ sudo pacman -S poppler
+```