this derivation will be built:
  /nix/store/g9762fi3wax8swlkbxlhb92a66zplm8b-pg_regress-15.19.drv
building '/nix/store/g9762fi3wax8swlkbxlhb92a66zplm8b-pg_regress-15.19.drv'
pg_regress-15.19> Running phase: installPhase