diff --git a/ext/mkrf_conf.rb b/ext/mkrf_conf.rb
deleted file mode 100644
index 290936a..0000000
--- a/ext/mkrf_conf.rb
+++ /dev/null
@@ -1,42 +0,0 @@
-install_dir = File.expand_path("../../../..", __FILE__)
-
-if !defined?(RUBY_ENGINE) || RUBY_ENGINE == 'ruby'
-  require 'rubygems'
-  require 'rubygems/command.rb'
-  require 'rubygems/dependency.rb'
-  require 'rubygems/dependency_installer.rb'
-
-  begin
-    Gem::Command.build_args = ARGV
-  rescue NoMethodError
-  end
-
-  if RUBY_VERSION < "1.9"
-    dep = Gem::Dependency.new("ruby-debug-base", '>=0.10.4')
-  elsif RUBY_VERSION < '2.0'
-    dep = Gem::Dependency.new("ruby-debug-base19x", '>=0.11.30.pre15')
-  else
-    dep = Gem::Dependency.new("debase", '> 0')
-  end
-
-  begin
-    puts "Installing base gem"
-    inst = Gem::DependencyInstaller.new(:prerelease => dep.prerelease?, :install_dir => install_dir)
-    inst.install dep
-  rescue
-    begin
-      inst = Gem::DependencyInstaller.new(:prerelease => true, :install_dir => install_dir)
-      inst.install dep
-    rescue Exception => e
-      puts e
-      puts e.backtrace.join "\n  "
-      exit(1)
-    end
-  end unless dep.nil? || dep.matching_specs.any?
-end
-
-# create dummy rakefile to indicate success
-f = File.open(File.join(File.dirname(__FILE__), "Rakefile"), "w")
-f.write("task :default\n")
-f.close
-
diff --git a/ruby-debug-ide.gemspec b/ruby-debug-ide.gemspec
index be0917f..cfbf8ac 100644
--- a/ruby-debug-ide.gemspec
+++ b/ruby-debug-ide.gemspec
@@ -39,8 +39,8 @@ EOF
   spec.executables = ["rdebug-ide", "gdb_wrapper"]
   spec.files = FILES
 
-  spec.extensions << "ext/mkrf_conf.rb" unless ENV['NO_EXT']
   spec.add_dependency("rake", ">= 0.8.1")
+  spec.add_dependency("debase", "> 0")
 
   spec.required_ruby_version = '>= 1.8.2'
   spec.date = DateTime.now