--- /usr/portage/dev-haskell/cipher-aes/cipher-aes-0.2.10.ebuild	2015-04-09 10:54:58.123924531 +0000
+++ /usr/portage/dev-haskell/cipher-aes/cipher-aes-0.2.10.ebuild	2015-04-09 10:54:54.952911046 +0000
@@ -17,8 +17,10 @@ 
 LICENSE="BSD"
 SLOT="0/${PV}"
 KEYWORDS="~amd64 ~x86"
-IUSE="cpu_flags_x86_aes"
+IUSE="cpu_flags_x86_aes cpu_flags_x86_ssse3"
 
+REQUIRED_USE="cpu_flags_x86_aes? ( cpu_flags_x86_ssse3 )
+	cpu_flags_x86_ssse3? ( cpu_flags_x86_aes )"
 RDEPEND="dev-haskell/byteable:=[profile?]
 	>=dev-haskell/crypto-cipher-types-0.0.6:=[profile?] <dev-haskell/crypto-cipher-types-0.1:=[profile?]
 	>=dev-haskell/securemem-0.1.2:=[profile?]