diff --git a/lib/homebrew-fork/Library/Homebrew/build.rb b/lib/homebrew-fork/Library/Homebrew/build.rb
index 7d9a7ab9d833b..2adc03ac3973a 100644
--- a/lib/homebrew-fork/Library/Homebrew/build.rb
+++ b/lib/homebrew-fork/Library/Homebrew/build.rb
@@ -8,7 +8,6 @@
 require "cxxstdlib"
 require "keg"
 require "extend/ENV"
-require "debrew"
 require "fcntl"
 
 class Build
@@ -38,11 +37,6 @@ def install
       ENV.setup_build_environment(formula)
     end
 
-    if ARGV.debug?
-      formula.extend(Debrew::Formula)
-      formula.resources.each { |r| r.extend(Debrew::Resource) }
-    end
-
     formula.brew do
       if ARGV.flag? '--git'
         system "git", "init"
diff --git a/lib/homebrew-fork/Library/Homebrew/debrew.rb b/lib/homebrew-fork/Library/Homebrew/debrew.rb
deleted file mode 100644
index dae4a9758f78d..0000000000000
--- a/lib/homebrew-fork/Library/Homebrew/debrew.rb
+++ /dev/null
@@ -1,158 +0,0 @@
-require "mutex_m"
-
-module Debrew
-  extend Mutex_m
-
-  Ignorable = Module.new
-
-  module Raise
-    def raise(*)
-      super
-    rescue Exception => e
-      e.extend(Ignorable)
-      super(e) unless Debrew.debug(e) == :ignore
-    end
-
-    alias_method :fail, :raise
-  end
-
-  module Formula
-    def install
-      Debrew.debrew { super }
-    end
-
-    def test
-      Debrew.debrew { super }
-    end
-  end
-
-  module Resource
-    def unpack(target=nil)
-      return super if target
-      super do
-        begin
-          yield self
-        rescue Exception => e
-          Debrew.debug(e)
-        end
-      end
-    end
-  end
-
-  class Menu
-    Entry = Struct.new(:name, :action)
-
-    attr_accessor :prompt, :entries
-
-    def initialize
-      @entries = []
-    end
-
-    def choice(name, &action)
-      entries << Entry.new(name.to_s, action)
-    end
-
-    def self.choose
-      menu = new
-      yield menu
-
-      choice = nil
-      while choice.nil?
-        menu.entries.each_with_index { |e, i| puts "#{i+1}. #{e.name}" }
-        print menu.prompt unless menu.prompt.nil?
-
-        input = $stdin.gets or exit
-        input.chomp!
-
-        i = input.to_i
-        if i > 0
-          choice = menu.entries[i-1]
-        else
-          possible = menu.entries.find_all { |e| e.name.start_with?(input) }
-
-          case possible.size
-          when 0 then puts "No such option"
-          when 1 then choice = possible.first
-          else puts "Multiple options match: #{possible.map(&:name).join(" ")}"
-          end
-        end
-      end
-
-      choice[:action].call
-    end
-  end
-
-  class << self
-    alias_method :original_raise, :raise
-  end
-
-  @active = false
-  @debugged_exceptions = Set.new
-
-  def self.active?
-    @active
-  end
-
-  def self.debugged_exceptions
-    @debugged_exceptions
-  end
-
-  def self.debrew
-    @active = true
-    Object.send(:include, Raise)
-
-    begin
-      yield
-    rescue SystemExit
-      original_raise
-    rescue Exception => e
-      debug(e)
-    ensure
-      @active = false
-    end
-  end
-
-  def self.debug(e)
-    original_raise(e) unless active? &&
-                             debugged_exceptions.add?(e) &&
-                             try_lock
-
-    begin
-      puts "#{e.backtrace.first}"
-      puts "#{Tty.red}#{e.class.name}#{Tty.reset}: #{e}"
-
-      loop do
-        Menu.choose do |menu|
-          menu.prompt = "Choose an action: "
-
-          menu.choice(:raise) { original_raise(e) }
-          menu.choice(:ignore) { return :ignore } if Ignorable === e
-          menu.choice(:backtrace) { puts e.backtrace }
-
-          unless ENV["HOMEBREW_NO_READLINE"]
-            require "debrew/irb"
-
-            menu.choice(:irb) do
-              puts "When you exit this IRB session, execution will continue."
-              set_trace_func proc { |event, _, _, id, binding, klass|
-                if klass == Raise && id == :raise && event == "return"
-                  set_trace_func(nil)
-                  synchronize { IRB.start_within(binding) }
-                end
-              }
-
-              return :ignore
-            end if Ignorable === e
-          end
-
-          menu.choice(:shell) do
-            puts "When you exit this shell, you will return to the menu."
-            interactive_shell
-          end
-        end
-      end
-    ensure
-      unlock
-    end
-  end
-end