this derivation will be built:
  /nix/store/2qk2rvyjdnaw0vxpwwybpb9kr62h618l-pg_regress-15.19.drv
building '/nix/store/2qk2rvyjdnaw0vxpwwybpb9kr62h618l-pg_regress-15.19.drv'
pg_regress-15.19> Running phase: installPhase