Ruby SDK problem for developer preview (OS X)

The developer preview copy of the ruby gem is asking for 1.1.0dp8, and i’m on 2.0.0beta.
Any help to get around this would be great. thanks.
brew install https://raw.github.com/couchbase/homebrew/preview/Library/Formula/libcou
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==> Installing libcouchbase dependency: libevent
==> Downloading https://github.com/downloads/libevent/libevent/libevent-2.0.20-stable.ta
Already downloaded: /Library/Caches/Homebrew/libevent-2.0.20.tar.gz
==> ./configure --disable-debug-mode --prefix=/usr/local/Cellar/libevent/2.0.20
==> make
==> make install
/usr/local/Cellar/libevent/2.0.20: 48 files, 1.8M, built in 27 seconds
==> Installing libcouchbase dependency: libvbucket
==> Downloading http://packages.couchbase.com/clients/c/libvbucket-1.8.0.4.tar.gz
Already downloaded: /Library/Caches/Homebrew/libvbucket-1.8.0.4.tar.gz
==> ./configure --prefix=/usr/local/Cellar/libvbucket/1.8.0.4 --without-docs
==> make install
/usr/local/Cellar/libvbucket/1.8.0.4: 8 files, 100K, built in 6 seconds
==> Installing libcouchbase
==> Downloading http://packages.couchbase.com/clients/c/libcouchbase-2.0.0beta.tar.gz
Already downloaded: /Library/Caches/Homebrew/libcouchbase-2.0.0beta.tar.gz
==> ./configure --prefix=/usr/local/Cellar/libcouchbase/2.0.0beta --disable-couchbasemock
==> make install
/usr/local/Cellar/libcouchbase/2.0.0beta: 17 files, 432K, built in 14 seconds
[dmk]Roberto<0> gem install couchbase-1.2.0.dp6.gem
Building native extensions. This could take a while…
ERROR: Error installing couchbase-1.2.0.dp6.gem:
ERROR: Failed to build gem native extension.
/Users/dmk/.rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb
checking for libcouchbase_get_num_replicas() in -lcouchbase… no
You should install libcouchbase >= 1.1.0dp8. See http://www.couchbase.com/develop/ for more details
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.
Provided configuration options:
–with-opt-dir
–with-opt-include
–without-opt-include=${opt-dir}/include
–with-opt-lib
–without-opt-lib=${opt-dir}/lib
–with-make-prog
–without-make-prog
–srcdir=.
–curdir
–ruby=/Users/dmk/.rvm/rubies/ruby-1.9.3-p194/bin/ruby
–with-libcouchbase-dir
–without-libcouchbase-dir
–with-libcouchbase-include
–without-libcouchbase-include=${libcouchbase-dir}/include
–with-libcouchbase-lib
–without-libcouchbase-lib=${libcouchbase-dir}/lib
–with-couchbaselib
–without-couchbaselib
Gem files will remain installed in /Users/dmk/.rvm/gems/ruby-1.9.3-p194/gems/couchbase-1.2.0.dp6 for inspection.
Results logged to /Users/dmk/.rvm/gems/ruby-1.9.3-p194/gems/couchbase-1.2.0.dp6/ext/couchbase_ext/gem_make.out

Just today, we released updates for the Ruby gem and libcouchbase.
Head to couchbase.com/develop and first install the C client library via the homebrew recipe, then install the rubygem with the --pre option and you should be all set!