diff --git a/lib/racc/rdoc/grammar.en.rdoc b/doc/en/grammar2.en.rdoc
similarity index 100%
rename from lib/racc/rdoc/grammar.en.rdoc
rename to doc/en/grammar2.en.rdoc
diff --git a/lib/racc/pre-setup b/lib/racc/pre-setup
deleted file mode 100644
index 5027d865..00000000
--- a/lib/racc/pre-setup
+++ /dev/null
@@ -1,13 +0,0 @@
-def generate_parser_text_rb(target)
-  return if File.exist?(srcfile(target))
-  $stderr.puts "generating #{target}..."
-  File.open(target, 'w') {|f|
-    f.puts "module Racc"
-    f.puts "  PARSER_TEXT = <<'__end_of_file__'"
-    f.puts File.read(srcfile('parser.rb'))
-    f.puts "__end_of_file__"
-    f.puts "end"
-  }
-end
-
-generate_parser_text_rb 'parser-text.rb'
diff --git a/racc.gemspec b/racc.gemspec
index 810f9a76..20f38925 100644
--- a/racc.gemspec
+++ b/racc.gemspec
@@ -24,10 +24,10 @@ DESC
   s.licenses = ["Ruby", "BSD-2-Clause"]
   s.executables = ["racc"]
   s.files = [
-    "COPYING", "ChangeLog",
-    "README.ja.rdoc", "README.rdoc", "Rakefile", "TODO", "bin/racc",
+    "COPYING", "ChangeLog", "TODO",
+    "README.ja.rdoc", "README.rdoc", "bin/racc",
     "ext/racc/MANIFEST",
-    "ext/racc/com/headius/racc/Cparse.java", "ext/racc/cparse/cparse.c",
+    "ext/racc/cparse/cparse.c",
     "ext/racc/cparse/extconf.rb",
     "lib/racc.rb", "lib/racc/compat.rb",
     "lib/racc/debugflags.rb", "lib/racc/exception.rb",
@@ -35,17 +35,14 @@ DESC
     "lib/racc/info.rb", "lib/racc/iset.rb",
     "lib/racc/logfilegenerator.rb", "lib/racc/parser-text.rb",
     "lib/racc/parser.rb", "lib/racc/parserfilegenerator.rb",
-    "lib/racc/pre-setup", "lib/racc/sourcetext.rb",
+    "lib/racc/sourcetext.rb",
     "lib/racc/state.rb", "lib/racc/statetransitiontable.rb",
-    "lib/racc/static.rb", "doc/en/NEWS.en.rdoc",
+    "lib/racc/static.rb",
+    "doc/en/NEWS.en.rdoc", "doc/en/grammar2.en.rdoc",
     "doc/en/grammar.en.rdoc", "doc/ja/NEWS.ja.rdoc",
     "doc/ja/command.ja.html", "doc/ja/debug.ja.rdoc",
     "doc/ja/grammar.ja.rdoc", "doc/ja/index.ja.html",
     "doc/ja/parser.ja.rdoc", "doc/ja/usage.ja.html",
-    "sample/array.y", "sample/array2.y", "sample/calc-ja.y",
-    "sample/calc.y", "sample/conflict.y", "sample/hash.y",
-    "sample/lalr.y", "sample/lists.y", "sample/syntax.y",
-    "sample/yyerr.y"
   ]
   s.require_paths = ["lib"]
   s.required_ruby_version = ">= 2.5"