I'm new to id-utils, but I read the info pages and it processess plain text files in addition to source. I figure more is better in this case -- there may be relevant notes outside src/ and I ran mkid accordingly.
In 2006, Claudio Fontana modernized the build system and the code itself, and analyzed and integrated various pending patches. Package name had a minor change from id-utils' toidutils', to be more consistent with the other GNU package names.