We still do if we continue to support the module level 'EnvPrefix'. For example:

```
globalconf.EnvPrefix = "MYAPP_"
cfg := globalconf.NewWithOptions(&Options{})
```
After NewWithOptions returns, globalconf.EnvPrefix will have been reset to "".

If we want to drop support for setting EnvPrefix at the module level, then I can drop the conditional, but one of my goals with this project was to make zero backwards-incompatibile changes. Let me know how you feel about it.