withEnv(build_env()) {
        nexusArtifactUploader artifactId: 'client', classifier: 'linux', credentialsId: '', file: env.ARTIFACT, groupId: 'example', nexusPassword: '', nexusUrl: 'example:8081/nexus', nexusUser: 'deployment', packaging: 'tar.bz2', protocol: 'http', repository: env.REPO, type: '', version: env.JVERSION
      }

def build_env() {
  def env_filename = env.BUILD_TAG + '.build.env'
  sh './buildenv.sh > /tmp/${BUILD_TAG}.build.env'
  def prop_list = readFile('/tmp/' + env_filename).split('\n')
  return prop_list
}

# cat /tmp/jenkins-pycan-28.build.env
PYVERSION=3.3.6a
JVERSION=3.3.6-SNAPSHOT
REPO=snapshots
PENDO_ARTIFACT=/tmp/conda-bld/linux-64/example-3.3.6a-py_0.tar.bz2
PYTHON_DEPS_ARTIFACT=python-dependencies/example-pip-dependencies-3.3.6a-py35_0.tar.bz2

java.lang.ClassCastException: org.jenkinsci.plugins.workflow.steps.EnvStep.overrides expects java.util.List<java.lang.String> but received class [Ljava.lang.String;