Steps for buliding couchbase-2.2.0 on ubuntu trusty ppc64le environment.
1. Take a backup of existing repositories and add 2 repositories (multiverse, universe) in /etc/apt/sources.list file
   $ cp /etc/apt/sources.list /etc/apt/sources.list.bkp
   $ echo deb http://ports.ubuntu.com/ubuntu-ports trusty multiverse universe >> /etc/apt/sources.list
   
   # Remove packages from local repository (to avoid size mismatch error)
   $ apt-get clean

   # Download the package lists from the repositories and "updates" them to get information on the newest versions of packages and their dependencies
   $ apt-get update

2. Create directory for installing couchbase 
   $ mkdir couchbase-trusty
   $ cd couchbase-trusty/

3. Install required packages to build couchbase 
   $ apt-get install -y curl gcc g++ automake autoconf make python libtool libevent-2.0-5 libevent-dev libsnappy-dev libicu-dev libcurl4-gnutls-dev nodejs-dev git erlang-src erlang-eunit erlang-dev check 

4. Create binary folder for keeping ‘repo’ binary which is used to fetch/sync couchbase code and add it to PATH variable
   $ mkdir ~/bin
   $ PATH=~/bin:$PATH

5. Download repo tool and initionalize repository  
   $ curl https://storage.googleapis.com/git-repo-downloads/repo > ~/bin/repo
   $ chmod a+x ~/bin/repo
   $ repo init -u git://github.com/couchbase/manifest.git -m released/2.2.0.xml

   # Fetch source of couchbase and dependent packages
   $ repo sync
   
   # Compile a code 
   $ make 

Note: If you encounter error like 'error.GitError: manifests var: *** Please tell me who you are.' at  OR 'fatal: unable to auto-detect email address'
at a time of initializing repository please follow below steps to resolve it.
 
# Adding git configuration 
git config --global user.email "<your_email_address>"
git config --global user.name "<Your name>" 

After configuring git please re-initialize repository using ‘repo init’ command