Bugzilla Bug 192046

Patch below...

--- sabayon-2.18.1.ebuild       2007-08-28 20:05:39.000000000 +0200
+++ sabayon-2.18.1.ebuild       2007-09-10 22:31:47.000000000 +0200
@@ -2,7 +2,7 @@
 # Distributed under the terms of the GNU General Public License v2
 # $Header: /var/cvsroot/gentoo-x86/app-admin/sabayon/sabayon-2.18.1.ebuild,v
1.7 2007/08/28 17:52:32 jer Exp $

-inherit gnome2 eutils python multilib
+inherit gnome2 eutils python multilib pam

 DESCRIPTION="Tool to maintain user profiles in a GNOME desktop"
 HOMEPAGE="http://www.gnome.org/projects/sabayon/"
@@ -51,7 +51,7 @@
        G2CONF="--with-distro=gentoo \
                --with-prototype-user=${PN}-admin \
                --enable-console-helper=no \
-               --with-pam-prefix=/lib/security"
+               --with-pam-prefix=$(getpam_mod_dir)"

        einfo "Adding user '${PN}-admin' as the prototype user"
        # I think /var/lib/sabayon is the correct directory to use here.

fixed in 2.18 and 2.20