Added formula for odt2txt tool.

Created a new Homebrew formula for the odt2txt command-line document-to-text conversion tool.  Installs
to a snapshot version with Mac support in the Makefile.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

* Remove "/opt" paths from Makefile

Formula/odt2txt.rb

@@ -0,0 +1,20 @@
+require 'formula'
+
+class Odt2txt <Formula
+  # Retrieve the HEAD because no releases have been made since the commit that
+  # includes Makefile rules for Mac OS X.
+  head 'git://repo.or.cz/odt2txt.git'
+  homepage 'http://stosberg.net/odt2txt/'
+
+  def install
+    inreplace "Makefile" do |s|
+      # Don't add /opt on OS X
+      s.gsub! "CFLAGS += -I/opt/local/include", ""
+      s.gsub! "LDFLAGS += -L/opt/local/lib", ""
+    end
+
+    # Uses a custom makefile instead of autoconf; we set DESTDIR to the prefix value
+    # Use the -B flag to force make the install target to circumvent bugs in the Makefile
+    system "make", "-B", "DESTDIR=#{prefix}", "install"
+  end
+end