this derivation will be built:
  /nix/store/kky6zy44p58hdmqx35d96a2wvmvjyhqs-pg_regress-15.19.drv
building '/nix/store/kky6zy44p58hdmqx35d96a2wvmvjyhqs-pg_regress-15.19.drv'
pg_regress-15.19> Running phase: installPhase