Avoid including environmental variables on source installs where they don't exist
Avoid including environmental variables on source installs where they don't exist

Signed-off-by: Tim Smith <764ef62106582a09ed09dfa0b6bff7c05fd7d1e4@chef.io>

schubergphilis/nrpe,schubergphilis/nrpe,schubergphilis/nrpe