The packages depending on mtdev that I see (xf86-input-evdev and xf86-input-synaptics) include a linux-headers dependency anyway, so there is no point in RDEPEND (especially so since linux-headers in part of @system).
> in part "is part"
--- mtdev-1.1.2.ebuild 24 Jun 2012 18:40:56 -0000 1.5 +++ mtdev-1.1.2.ebuild 27 Jun 2012 01:07:32 -0000 @@ -13,7 +13,7 @@ KEYWORDS="~alpha amd64 ~arm ~hppa ~ia64 ~mips ~ppc ~ppc64 ~sh ~sparc x86" IUSE="static-libs" -RDEPEND=">=sys-kernel/linux-headers-2.6" +DEPEND=">=sys-kernel/linux-headers-2.6" src_configure() { econf $(use_enable static-libs static)
Applied to the tree. Thanks.