in herdstat-1.1.2_rc1.ebuild IUSE contains the "ncurses" flag, yet sys-lib/ncurses is not in DEPEND: IUSE="debug doc ncurses" RDEPEND=">=dev-cpp/libherdstat-0.1.0" DEPEND="${RDEPEND} >=sys-apps/sed-4 dev-util/pkgconfig doc? ( dev-python/docutils )"
Firstly, please read the package's metadata.xml to find who the maintainer is. tools-portage@ is not it. ncurses is already included in 'emerge system' and doesn't really need to be listed in the deps. That sed doesnt really need to be there either.