localhost ~ # emerge -uav --autounmask=n gentoo-sources

These are the packages that would be merged, in order:

Calculating dependencies                              ... done!

emerge: there are no ebuilds built with USE flags to satisfy ">=sys-fs/eudev-1.5.3-r1:0/0[abi_x86_32(-)?,abi_x86_64(-)?,abi_x86_x32(-)?,abi_mips_n32(-)?,abi_mips_n64(-)?,abi_mips_o32(-)?,abi_ppc_32(-)?,abi_ppc_64(-)?,abi_s390_32(-)?,abi_s390_64(-)?,gudev,introspection?,static-libs?]".
!!! One of the following packages is required to complete your request:
- sys-fs/eudev-1.9-r1::gentoo (Change USE: +static-libs)
- virtual/libgudev-208::gentoo (Change USE: -static-libs)
(dependency required by "virtual/libgudev-208" [installed])
(dependency required by "virtual/udev-208-r2[gudev]" [installed])
(dependency required by "virtual/dev-manager-0" [installed])
(dependency required by "sys-kernel/gentoo-sources-3.15.6[-build]" [ebuild])
(dependency required by "gentoo-sources" [argument])