Zsh formula

Zsh is a shell designed for interactive use, although it is also a powerful
scripting language. More information can be found on the "Zsh Web Pages"
sites.

Signed-off-by: Max Howell <max@methylblue.com>

I de-versioned the install directories aas this is typically what we do.

Formula/zsh.rb

@@ -0,0 +1,26 @@
+require 'brewkit'
+
+class Zsh <Formula
+  @url='http://downloads.sourceforge.net/project/zsh/zsh-dev/4.3.10/zsh-4.3.10.tar.gz'
+  @homepage='http://www.zsh.org/'
+  @md5='031efc8c8efb9778ffa8afbcd75f0152'
+
+  def install
+    system "./configure", "--disable-debug",
+                          "--prefix=#{prefix}",
+                          "--disable-dependency-tracking",
+                          # don't version stuff in Homebrew, we already do that!
+                          "--enable-fndir=#{share}/zsh/functions",
+                          "--enable-scriptdir=#{share}/zsh/scripts"
+
+    # again don't version installation directories
+    inreplace "Src/Makefile", "$(libdir)/$(tzsh)/$(VERSION)", "$(libdir)"
+    inreplace "Makefile", "$(libdir)/$(tzsh)/$(VERSION)", "$(libdir)"
+
+    system "make install"
+  end
+  
+  def skip_clean? path
+    true
+  end
+end