D7151: setup: allow py3 install without env vars

[mharbison72 (Matt Harbison)]

mharbison72 added a comment.
mharbison72 accepted this revision.


  I guess you can backout a324f6a0cfd3 <https://phab.mercurial-scm.org/rHGa324f6a0cfd3bcfb0382213717bd244e090c25f9> with this.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D7151/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D7151

To: Kwan, #hg-reviewers, mharbison72
Cc: mharbison72, dlax, mercurial-devel