hercules --HEAD

Closes Homebrew/homebrew#28922.

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

Formula/hercules.rb

@@ -7,12 +7,36 @@ class Hercules < Formula
 
   skip_clean :la
 
+  head do
+    url 'https://github.com/hercules-390/hyperion.git'
+    depends_on :autoconf
+    depends_on :automake
+    depends_on :libtool
+  end
+
   def install
-    # Since Homebrew optimizes for us, tell Hercules not to.
-    # (It gets it wrong anyway.)
-    system "./configure", "--disable-debug", "--disable-dependency-tracking",
-                          "--prefix=#{prefix}",
-                          "--enable-optimization=no"
+    if build.head?
+      ENV.append 'CFLAGS', '-D_FORTIFY_SOURCE=0' if MacOS.version >= :maverick
+
+      # bundled autoconf.sh omits --add-missing
+      system "aclocal -I m4 -I autoconf"
+      system "autoheader"
+      system "automake --add-missing"
+      system "autoconf"
+
+      # IPv6 doesn't build on OSX
+      system "./configure", "--disable-debug", "--disable-dependency-tracking",
+                            "--prefix=#{prefix}",
+                            "--disable-ipv6",
+                            "--enable-optimization=no"
+    else
+      # Since Homebrew optimizes for us, tell Hercules not to.
+      # (It gets it wrong anyway.)
+      system "./configure", "--disable-debug", "--disable-dependency-tracking",
+                            "--prefix=#{prefix}",
+                            "--enable-optimization=no"
+    end
+
     system "make"
     system "make install"
   end