diff --git a/Library/Homebrew/extend/ENV.rb b/Library/Homebrew/extend/ENV.rb
index cbed277463..fda383f6fe 100644
--- a/Library/Homebrew/extend/ENV.rb
+++ b/Library/Homebrew/extend/ENV.rb
@@ -246,12 +246,7 @@ module HomebrewEnvExtension
     end
   end
 
-  def x11 silent=false
-    unless MacOS::X11.installed?
-      opoo "You do not have X11 installed, this formula may not build." unless silent
-      return
-    end
-
+  def x11
     # There are some config scripts here that should go in the PATH
     prepend 'PATH', MacOS::X11.bin, ':'
 
diff --git a/Library/Homebrew/test/test_ENV.rb b/Library/Homebrew/test/test_ENV.rb
index 7b71e494f2..5b87217474 100644
--- a/Library/Homebrew/test/test_ENV.rb
+++ b/Library/Homebrew/test/test_ENV.rb
@@ -15,7 +15,6 @@ class EnvironmentTests < Test::Unit::TestCase
     ENV.minimal_optimization
     ENV.no_optimization
     ENV.libxml2
-    ENV.x11 true
     ENV.enable_warnings
     assert !ENV.cc.empty?
     assert !ENV.cxx.empty?