diff --git a/Gemfile b/Gemfile
index 50439f10a..2ffe22427 100644
--- a/Gemfile
+++ b/Gemfile
@@ -75,6 +75,11 @@ group :test do
   gem "mocha"
 end
 
+if File.exists?('Gemfile.local')
+  puts "Loading Gemfile.local ..." if $DEBUG # `ruby -d` or `bundle -v`
+  instance_eval File.read('Gemfile.local')
+end
+
 # Load plugins' Gemfiles
 Dir.glob File.expand_path("../vendor/plugins/*/Gemfile", __FILE__) do |file|
   puts "Loading #{file} ..." if $DEBUG # `ruby -d` or `bundle -v`
diff --git a/doc/INSTALL b/doc/INSTALL
index e7badf150..ea31d0dcf 100644
--- a/doc/INSTALL
+++ b/doc/INSTALL
@@ -31,6 +31,10 @@ Optional:
    of the rmagick gem using:
      bundle install --without development test rmagick
 
+   If you need to load some gems that are not required by Redmine core (eg. fcgi),
+   you can create a file named Gemfile.local at the root of your redmine directory.
+   It will be loaded automatically when running `bundle install`.
+
 3. Create an empty utf8 encoded database: "redmine" for example
 
 4. Configure the database parameters in config/database.yml