This info document has no INFO-DIR-SECTION line. install-info will be unable to determine the section into which this info page should be put. The best solution is to add a line like:
@dircategory Software development
to the texinfo source so that the generated info file will contain a section. See /usr/share/info/dir for sections to choose from. You will have to ensure that the build process builds new info files rather than using ones built by upstream.