extconf.rb

require 'mkmf'

create_makefile('ruby_http_parser')

gistfile1.txt

oscar: ~/code/http-parser % ls -R ext 
ruby_http_parser

ext/ruby_http_parser:
Makefile                extconf.rb              ruby_http_parser.bundle ruby_http_parser.c      ruby_http_parser.o

Rakefile

require 'rake/testtask'
require 'rake/clean'

# rule to build the extension: this says
# that the extension should be rebuilt
# after any change to the files in ext
file "lib/http-parser/ruby_http_parser.so" =>
Dir.glob("ext/ruby_http_parser/*{.rb,.c}") do
  Dir.chdir("ext/ruby_http_parser") do
    # this does essentially the same thing
    # as what RubyGems does
    ruby "extconf.rb"
    sh "make"
  end
  cp "ext/ruby_http_parser/ruby_http_parser.so", "lib/http-parser"
end

# make the :test task depend on the shared
# object, so it will be built automatically
# before running the tests
task :test => "lib/http-parser/ruby_http_parser.so"

# use 'rake clean' and 'rake clobber' to
# easily delete generated files
CLEAN.include('ext/**/*{.o,.log,.so}')
CLEAN.include('ext/**/Makefile')
CLOBBER.include('lib/**/*.so')

# the same as before
Rake::TestTask.new do |t|
  t.libs << 'test'
end

desc "Run tests"
task :default => :test