--- /usr/portage/sys-kernel/spl/spl-0.6.0_rc13.ebuild	2013-01-06 20:08:56.910000282 +0100
+++ /usr/portage/sys-kernel/spl/spl-0.6.0_rc13-r1.ebuild	2013-01-06 20:17:15.650000282 +0100
@@ -66,6 +66,7 @@
 		--with-config=all
 		--with-linux="${KV_DIR}"
 		--with-linux-obj="${KV_OUT_DIR}"
+		$(use x86 && echo "--enable-atomic-spinlocks")
 		$(use_enable debug)
 		$(use_enable debug-log)
 	)