freebsd port of homebrew and bugfix for unintentional altering file permissions for executables

gistfile1.txt

$ git diff ../Library/Homebrew/
diff --git a/Library/Homebrew/cleaner.rb b/Library/Homebrew/cleaner.rb
index 58b1a3b..96f2d1e 100644
--- a/Library/Homebrew/cleaner.rb
+++ b/Library/Homebrew/cleaner.rb
@@ -41,6 +41,9 @@ private
     when /Mach-O [^ ]* ?executable/
       strip path
       perms=0555
+    when /ELF (.*) executable/
+      strip path
+      perms=0555
     when /script text executable/
       perms=0555
     end
diff --git a/Library/Homebrew/extend/ENV.rb b/Library/Homebrew/extend/ENV.rb
index 5382020..8654910 100644
--- a/Library/Homebrew/extend/ENV.rb
+++ b/Library/Homebrew/extend/ENV.rb
@@ -21,7 +21,7 @@ module HomebrewEnvExtension
       self['CMAKE_PREFIX_PATH'] = "#{HOMEBREW_PREFIX}"
     end
 
-    if SystemCommand.platform == :linux
+    if SystemCommand.platform == :linux || SystemCommand.platform == :freebsd
       self['CC'] = '/usr/bin/cc'
       self['CXX'] = '/usr/bin/c++'
       cflags = ['-O3']
diff --git a/Library/Homebrew/system_command.rb b/Library/Homebrew/system_command.rb
index 834f3d4..89a75c9 100644
--- a/Library/Homebrew/system_command.rb
+++ b/Library/Homebrew/system_command.rb
@@ -6,6 +6,8 @@ module Homebrew
         :linux
       elsif RUBY_PLATFORM =~ /.*-darwin.*/
         :mac
+      elsif RUBY_PLATFORM =~ /.*-freebsd.*/      
+        :freebsd
       else
         :dunno
       end
@@ -27,6 +29,8 @@ module Homebrew
         @@provider ||= SystemCommandLinux.new
       when 'Darwin'
         @@provider ||= SystemCommandMac.new
+      when 'FreeBSD'
+        @@provider ||= SystemCommandFreeBSD.new
       else
         raise Exception.new 'Unknown platform. Aborting.'
       end
@@ -79,4 +83,10 @@ module Homebrew
     end
 
   end
+
+  class SystemCommandFreeBSD < SystemCommandMac
+    def which_s
+      "/usr/bin/which"
+    end
+  end
 end