1 files changed, 41 insertions, 5 deletions
diff --git a/Library/Formula/yasm.rb b/Library/Formula/yasm.rb
index 527cc8d06..07b5da792 100644
--- a/Library/Formula/yasm.rb
+++ b/Library/Formula/yasm.rb
@@ -1,12 +1,48 @@
 require 'formula'
 
 class Yasm < Formula
-  url 'http://www.tortall.net/projects/yasm/releases/yasm-1.2.0.tar.gz'
-  homepage 'http://www.tortall.net/projects/yasm/'
-  md5 '4cfc0686cf5350dd1305c4d905eb55a6'
+  homepage 'http://yasm.tortall.net/'
+  url 'http://tortall.net/projects/yasm/releases/yasm-1.2.0.tar.gz'
+  sha256 '768ffab457b90a20a6d895c39749adb547c1b7cb5c108e84b151a838a23ccf31'
+
+  head 'https://github.com/yasm/yasm.git'
+
+  def options
+    [['--enable-python', 'Enable Python bindings support.']]
+  end
+
+  if ARGV.build_head?
+    depends_on 'gettext'
+    depends_on 'automake' => :build if MacOS.xcode_version.to_f >= 4.3
+  end
+
+  depends_on 'Cython' => :python if ARGV.include? '--enable-python'
 
   def install
-    system "./configure", "--prefix=#{prefix}", "--disable-debug", "--disable-dependency-tracking"
-    system "make install"
+    args = %W[--prefix=#{prefix} --disable-debug]
+
+    if ARGV.include? '--enable-python'
+      args << '--enable-python'
+      args << '--enable-python-bindings'
+    end
+
+    system './autogen.sh' if ARGV.build_head?
+    system './configure', *args
+    system 'make install'
+  end
+
+  def caveats
+    if ARGV.include? '--enable-python' then <<-EOS.undent
+      Python bindings installed to:
+        #{HOMEBREW_PREFIX}/lib/#{which_python}/site-packages
+
+      For non-homebrew Python, you need to amend your PYTHONPATH like so:
+        export PYTHONPATH=#{HOMEBREW_PREFIX}/lib/#{which_python}/site-packages:$PYTHONPATH
+      EOS
+    end
+  end
+
+  def which_python
+    'python' + `python -c 'import sys;print(sys.version[:3])'`.strip
   end
 end