title: Unable to load package for //:abc/requirements.txt while generating par files using bazel
body: <p>I am trying to generate par files for my target. But it is unable to load the package present in one of the requirements.txt file mentioned in WORKSPACE. I m unable to figure what is actually expecting.</p>
  
  <p>Here is the error:</p>
  
  <pre><code>ERROR: error loading package '': Encountered error while reading extension file 'requirements.bzl': no such package '@abc_deps//': Traceback (most recent call last):
      File "/tmp/.cache/bazel/_bazel_pog/4dbff95ef3b73130029b349a5743e7e7/external/io_bazel_rules_python/python/pip.bzl", line 26
              repository_ctx.execute(["python", repository_ctx.path(r...("")])
      File "/tmp/.cache/bazel/_bazel_pog/4dbff95ef3b73130029b349a5743e7e7/external/io_bazel_rules_python/python/pip.bzl", line 32, in repository_ctx.execute
              repository_ctx.path(repository_ctx.attr.requirements)
  </code></pre>
  
  <p>Unable to load package for //:abc/requirements.txt: not found.</p>
  
  <p>Steps followed to install bazel in centos 7:</p>
  
  <pre><code>    wget https://github.com/bazelbuild/bazel/releases/download/0.17.2/bazel-0.17.2-linux-x86_64 -O ./bazel
      chmod +x ./bazel
      yum -y install gcc
      sudo yum install gcc-c++
      sudo yum install python-devel
      sudo yum install openldap-devel
  </code></pre>