If you change that to:
```
if [ ! -f `pg_config --pkglibdir`/json_enhancements.so ]; then sudo pgxn install json_enhancements ; fi
```
Then we don't depend on the hardcoded path to the `socorro-virtualenv`. And if the virtualenv (or any virtualenv for that matter) isn't activated, the `/bin/` won't be on PATH and it'll exit with error.