install postgresql pg gem into the sensu embedded ruby

pg_gem.rb

ark 'postgresql' do
  url 'https://ftp.postgresql.org/pub/source/v9.4.6/postgresql-9.4.6.tar.bz2'
end

# build and install postgresql into the sensu embedded install
execute 'configure postgresql' do
  command './configure --prefix /opt/sensu/embedded --with-openssl'
  not_if '/opt/sensu/embedded/bin/gem list pg -i'
  cwd '/usr/local/postgresql'
  environment(
    CFLAGS: '-I/opt/sensu/embedded/include',
    LDFLAGS: '-L/opt/sensu/embedded/lib'
  )
  notifies :run, 'execute[make postgresql]', :immediately
end

execute 'make postgresql' do
  command 'make'
  cwd '/usr/local/postgresql'
  action :nothing
  notifies :run, 'execute[make install postgresql]', :immediately
end

execute 'make install postgresql' do
  command 'make install'
  cwd '/usr/local/postgresql'
  action :nothing
end

sensu_gem 'pg'