diff --git a/Library/Homebrew/brewkit.rb b/Library/Homebrew/brewkit.rb
index 619e97cecf..a51c080f5e 100644
--- a/Library/Homebrew/brewkit.rb
+++ b/Library/Homebrew/brewkit.rb
@@ -49,6 +49,29 @@ def appsupport
   return appsupport
 end
 
+class BuildError <RuntimeError
+  def initialize cmd
+    super "Build failed during: #{cmd}"
+  end
+end
+
+# pass in the basename of the filename _without_ any file extension
+def extract_version basename
+  # eg. foobar4.5.1
+  # eg. foobar-4.5.1
+  # eg. foobar-4.5.1b
+  /^[^0-9]*((\d+\.)*(\d+-)?\d+[abc]?)$/.match basename
+  return $1 if $1
+
+  # eg. boost_1_39_0
+  /^[^0-9]*((\d+_)*\d+)$/.match basename
+  return $1.gsub('_', '.') if $1
+  
+  # eg. (erlang) otp_src_R13B
+  /^.*[-_.](.*)$/.match basename
+  return $1 if $1
+end
+
 
 # make our code neater
 class Pathname
@@ -62,6 +85,17 @@ class Pathname
       FileUtils.cp_r to_s, dst
     end
   end
+
+  def extname
+    /\.(zip|tar\.(gz|bz2)|tgz)$/.match to_s
+    return ".#{$1}" if $1
+    return File.extname(to_s)
+  end
+
+  # for files we support, basename without extension
+  def stem
+    return File.basename(to_s, extname)
+  end
 end
 
 
@@ -109,24 +143,6 @@ class AbstractFormula
     # end ruby is weird section
   end
 
-protected
-  # pass in the basename of the filename _without_ any file extension
-  def extract_version basename
-    # eg. foobar4.5.1
-    # eg. foobar-4.5.1
-    # eg. foobar-4.5.1b
-    /^[^0-9]*((\d+\.)*(\d+-)?\d+[abc]?)$/.match basename
-    return @version=$1 if $1
-
-    # eg. boost_1_39_0
-    /^[^0-9]*((\d+_)*\d+)$/.match basename
-    return @version=$1.gsub('_', '.') if $1
-    
-    # eg. (erlang) otp_src_R13B
-    /^.*[-_.](.*)$/.match basename
-    return @version=$1 if $1
-  end
-
 private
   def maybe_mkpath path
     path.mkpath unless path.exist?
@@ -265,12 +281,6 @@ class UnidentifiedFormula <AbstractFormula
   end
 
 private
-  def extname
-    /\.(zip|tar\.(gz|bz2)|tgz)$/.match @url
-    return ".#{$1}" if $1
-    raise "Only tarballs and zips are supported by this class"
-  end
-
   def uncompress(path)
     if path.extname == '.zip'
       `unzip -qq "#{path}"`
@@ -297,7 +307,7 @@ end
 class Formula <UnidentifiedFormula
   def initialize name
     super name
-    extract_version File.basename(@url, extname)
+    @version=extract_version Pathname.new(File.basename(@url)).stem
   end
 end
 
@@ -338,14 +348,17 @@ def system cmd
   IO.popen("#{cmd} 2>&1") do |f|
     until f.eof?
       s=f.gets
-      out+=s
-      puts s if ARGV.include? '--verbose'
+      if ARGV.include? '--verbose'
+        puts s
+      else
+        out+=s
+      end
     end
   end
 
   unless $? == 0
     puts out unless ARGV.include? '--verbose' #already did that above
-    raise "Failure during: #{cmd}"
+    raise BuildError.new(cmd)
   end
 end
 
diff --git a/Library/Homebrew/unittest.rb b/Library/Homebrew/unittest.rb
index d619b9601f..4ae7bc4f04 100755
--- a/Library/Homebrew/unittest.rb
+++ b/Library/Homebrew/unittest.rb
@@ -71,8 +71,6 @@ class BeerTasting <Test::Unit::TestCase
       TestFormula.new 'test-0.1.tgz'
       TestFormula.new 'test-0.1.zip'
     end
-    assert_raise(RuntimeError) {TestFormula.new 'test-0.1.7'}
-    assert_raise(RuntimeError) {TestFormula.new 'test-0.1.arse'}
   end
 
   def test_prefix
diff --git a/bin/brew b/bin/brew
index 23c38a5996..73d8faf2fe 100755
--- a/bin/brew
+++ b/bin/brew
@@ -235,19 +235,20 @@ begin
       shift_formulae_from_ARGV.each {|name| rm name}
     when 'mk'
       require 'brewkit'
-      class Template <Formula
-        @url=ARGV.shift
-      end
+      url=ARGV.shift
+      version=extract_version File.basename(url, Pathname.new(url).extname)
 
-      t=Template.new
-      /(.*)[-_.]#{t.version}/.match File.basename(t.url)
-      t.name = $1
+      /(.*?)[-_.]?#{version}/.match File.basename(url)
+      raise "Couldn't parse name from #{url}" if $1.nil?
 
-      f=File.new $formula+(t.name+'.rb'), 'w'
+      path=$formula+($1+'.rb')
+      raise "#{path} already exists!" if File.exist? path
+
+      f=File.new path, 'w'
       f.puts "require 'brewkit'"
       f.puts
-      f.puts "class #{__class t.name} <Formula"
-      f.puts "  @url=#{t.url}"
+      f.puts "class #{__class $1} <Formula"
+      f.puts "  @url='#{url}'"
       f.puts "  @md5=''"
       f.puts "  @homepage=''"
       f.puts
@@ -257,6 +258,8 @@ begin
       f.puts "  end"
       f.puts "end"
       f.close
+
+      puts path
     when 'info'
       o=__obj shift_formulae_from_ARGV[0]
       puts "#{o.name} #{o.version}"