I think it was introduced around 3.4. You could perhaps do some kind of preprocessing in the config (cpp, sed or m4) with a script if you'd like it in 3.2. On Jan 3, 2017 4:56 PM, "Broome, John P - OASAM OCIO CTR" < Broome.John.P@dol.gov> wrote:

Robert,

*Thanks for your reply, but we are constrained to version 3.2 for now (has to be in the RHEL EPEL). I did not see this feature discussed in the 3.2 admin guide. Is it an undocumented feature of version 3.2, or did support for system environment variables come in a later version?*

*Thank you,*

*JB*

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