ant-handling: (...)

```
case_default = "Source .%s tarball"
case_lower = "Source .%s tarball with lowercase name"

for ext in extensions:
    TEMPLATE_CONSTANTS += [
        ('SOURCE_%s' % ext.replace('.','_').upper(),             '%(name)s-%(version)s.'        + ext, case_default % ext))
        ('SOURCELOWER_%s' % ext.replace('.','_').upper(), '%(namelower)s-%(version)s.' + ext, case_lower % ext))
        ]
```