Rakefile in stackprof-0.2.20 vs Rakefile in stackprof-0.2.21

@@ -5,13 +5,23 @@
   t.libs << "test"
   t.libs << "lib"
   t.test_files = FileList["test/**/test_*.rb"]
 end
 
-require "rake/extensiontask"
+if RUBY_ENGINE == "truffleruby"
+  task :compile do
+    # noop
+  end
 
-Rake::ExtensionTask.new("stackprof") do |ext|
-  ext.ext_dir = "ext/stackprof"
-  ext.lib_dir = "lib/stackprof"
+  task :clean do
+    # noop
+  end
+else
+  require "rake/extensiontask"
+
+  Rake::ExtensionTask.new("stackprof") do |ext|
+    ext.ext_dir = "ext/stackprof"
+    ext.lib_dir = "lib/stackprof"
+  end
 end
 
 task default: %i(compile test)