Redmine

It seems that you can set the path of Imagemagick's client command to MiniMagick.cli_path.
https://rubydoc.info/github/minimagick/minimagick/MiniMagick/Configuration#cli_path-instance_method

I created a patch.

diff --git a/lib/redmine/helpers/gantt.rb b/lib/redmine/helpers/gantt.rb
index 122013e5a..7d078298c 100644
--- a/lib/redmine/helpers/gantt.rb
+++ b/lib/redmine/helpers/gantt.rb
@@ -395,6 +395,9 @@ module Redmine
           Redmine::Configuration['minimagick_font_path'].presence ||
             Redmine::Configuration['rmagick_font_path'].presence
         img = MiniMagick::Image.create(".#{format}", false)
+        if Redmine::Configuration['imagemagick_convert_command'].present?
+          MiniMagick.cli_path = File.dirname(Redmine::Configuration['imagemagick_convert_command'])
+        end
         MiniMagick::Tool::Convert.new do |gc|
           gc.size('%dx%d' % [subject_width + g_width + 1, height])
           gc.xc('white')

Setting the target version to 4.1.6.

Patch committed, thanks!

The patch can fix some issues when the convert command is not available in the global path, but the binary always must be named convert.

• MiniMagick.cli_path (used for Gantt PNG) will be set to /usr/local/bin and MiniMagick will look after convert binary inside that path.
• For thumbnail generation, it will be used the exact path from configuration: /usr/local/bin/convert.

In case of a different binary name (convert2 for example), the Gantt PNG will not work.