Reproduce:

$ djvudigital
djvudigital: cannot locate suitable ghostscript executable.
+--------------------------------------------------------------------+
| DjVuDigital relies on a special ghostscript device driver, but     |
| could not find a ghostscript executable that implement this driver.|
| Please visit http://djvu.sourceforge.net/gsdjvu.html.              |
+--------------------------------------------------------------------+

Upon reading the Web page, it seems that the issue is rather old: necessary code was released over 20 years ago under an incompatible license.  Has anything changed in the meantime so that djvudigital can work (or can be brought to work) without (or with less) additional steps now?