RDoc is not available since Ruby 3.5+

Author: hsbt

.github/workflows/gh-pages.yml

@@ -28,6 +28,8 @@ jobs:
       - name: Setup Pages
         id: pages
         uses: actions/configure-pages@v5
+      - name: Install dependencies
+        run: gem install rdoc
       - name: Build with RDoc
         # Outputs to the './_site' directory by default
         run: rake rdoc

Rakefile

@@ -2,10 +2,13 @@ require "bundler"
 
 Bundler::GemHelper.install_tasks
 
-require "rdoc/task"
-RDoc::Task.new do |doc|
-  doc.main   = "README.md"
-  doc.title  = "Curses: A Ruby binding for curses, ncurses, and PDCurses."
-  doc.rdoc_files = FileList.new %w[ext lib README.md BSDL COPYING]
-  doc.rdoc_dir = "_site" # for github pages
+begin
+  require "rdoc/task"
+  RDoc::Task.new do |doc|
+    doc.main   = "README.md"
+    doc.title  = "Curses: A Ruby binding for curses, ncurses, and PDCurses."
+    doc.rdoc_files = FileList.new %w[ext lib README.md BSDL COPYING]
+    doc.rdoc_dir = "_site" # for github pages
+  end
+rescue LoadError
 end