This is not a missing package, as some respondents seem to think; it's a sign that something went very wrong during building it and the result is broken at runtime. Usually on Linux this means something made use of stat() without #include-ing the appropriate header; stat() is often a macro on Linux which calls a different function depending on various compatibility options (large files, timestamp formats, etc.).

Unfortunately I don't know of any Gentoo-specific details for fixing the package, although I know how I'd go about trying to debug it as part of a source build.