The current homepage indicates that 1.0.1 is the last version written by the original author, and redirects to a new homepage. The newest versions available are 1.0.3a and 1.0.3b, but that seems to go against the Gentoo versioning scheme. So here is a working ebuild for 1.0.3, which uses taglib instead, and has a somewhat different compile sequence. 1344 file(s) added at /store/mp3/iRivNavi.iDB Works for me, at any rate.
Created attachment 48681 [details] iripdb-0.1.3.ebuild Ebuild used to build 1.0.3
Looking at this now...but as long as the trailing a or b stands for a "newer" version, and not alpha or beta (which it seems it does) then it is okay to use in an ebuild version name.
chainsaw@adrastea /store/mp3 $ iripdb -e -u /store/mp3 1642 file(s) added at /store/mp3/iRivNavi.iDB Bumped to 1.0.3b in portage.