this derivation will be built:
  /nix/store/pxmwyxqkv9548w8zf9kz2iipz0jzsi5v-pg_regress-15.19.drv
building '/nix/store/pxmwyxqkv9548w8zf9kz2iipz0jzsi5v-pg_regress-15.19.drv'
pg_regress-15.19> Running phase: installPhase