this derivation will be built:
  /nix/store/5p4bllngbmb8d6dh7gjgamwkhripv6n9-pg_regress-15.19.drv
building '/nix/store/5p4bllngbmb8d6dh7gjgamwkhripv6n9-pg_regress-15.19.drv'
pg_regress-15.19> Running phase: installPhase