Error when trying to install the HEAD version of opam via homebrew - Mac OS X 10.8.5

terminal-output

amir$ brew remove opam
Uninstalling /usr/local/Cellar/opam/1.1.1...
amir$ brew install opam --HEAD --without-aspcud 
==> Cloning https://github.com/ocaml/opam.git
Updating /Library/Caches/Homebrew/opam--git
==> Downloading http://ocamlgraph.lri.fr/download/ocamlgraph-1.8.1.tar.gz
Already downloaded: /Library/Caches/Homebrew/opam--ocamlgraph-1.8.1.tar.gz
==> Downloading https://github.com/ocaml/ocaml-re/archive/ocaml-re-1.2.0.tar.gz
Already downloaded: /Library/Caches/Homebrew/opam--ocaml-re-1.2.0.tar.gz
==> Downloading https://gforge.inria.fr/frs/download.php/31910/cudf-0.6.3.tar.gz
Already downloaded: /Library/Caches/Homebrew/opam--cudf-0.6.3.tar.gz
==> Downloading http://erratique.ch/software/cmdliner/releases/cmdliner-0.9.3.tbz
Already downloaded: /Library/Caches/Homebrew/opam--cmdliner-0.9.3.tbz
==> Downloading https://gforge.inria.fr/frs/download.php/31595/dose3-3.1.2.tar.gz
Already downloaded: /Library/Caches/Homebrew/opam--dose3-3.1.2.tar.gz
==> Downloading http://ocaml-extlib.googlecode.com/files/extlib-1.5.3.tar.gz
Already downloaded: /Library/Caches/Homebrew/opam--extlib-1.5.3.tar.gz
==> ./configure --prefix=/usr/local/Cellar/opam/HEAD
==> make
/usr/bin/make -C src opam-lib
Makefile:45: *** Dependencies missing. Either run 'make lib-ext' or install them and re-run './configure'.  Stop.
make: *** [opam-lib] Error 2

READ THIS: https://github.com/Homebrew/homebrew/wiki/troubleshooting