The pkg_nofetch() function for jdbc2-stdext recommends downloading the package documentation only if doc is in USE. However, the SRC_URI doesn't care about the use flag which breaks the emerge unless the docs file is present. The fix is a trivial: < SRC_URI="${stdext_bin} ${stdext_doc}" > SRC_URI="${stdext_bin} doc? ( ${stdext_doc} )"
thanks, commited.