snow-chibi index does not seem to work

foo/bar.sld
```
(define-library
  (foo bar)
  (import (scheme base)
          (retropikzel hello))
  (export hello))
``` 

```
snow-chibi package foo/bar.sld
snow-chibi index foo-bar.tgz
snow-chibi install foo.bar
Can't find package: (foo bar)
```
