iptables erro

# more /var/tmp/portage/net-firewall/iptables-1.4.15-r1/temp/build.log
 * Package:    net-firewall/iptables-1.4.15-r1
 * Repository: gentoo
 * Maintainer: [email protected] [email protected]
 * USE:        amd64 elibc_glibc ipv6 kernel_linux multilib userland_GNU
 * FEATURES:   sandbox
>>> Unpacking source...
>>> Unpacking iptables-1.4.15.tar.bz2 to /var/tmp/portage/net-firewall/iptables-1.4.15-r1/work
>>> Source unpacked in /var/tmp/portage/net-firewall/iptables-1.4.15-r1/work
>>> Preparing source in /var/tmp/portage/net-firewall/iptables-1.4.15-r1/work/iptables-1.4.15 ...
 * Running elibtoolize in: iptables-1.4.15/build-aux/
 *   Applying portage/1.2.0 patch ...

 * Portage patch failed to apply (ltmain.sh version 2.4.2 Debian-2.4.2-1.1)!
 * Please file a bug report to add a proper patch.
 * ERROR: net-firewall/iptables-1.4.15-r1 failed (prepare phase):
 *   Portage patch failed to apply!
 *
 * Call stack:
 *     ebuild.sh, line   85:  Called src_prepare
 *   environment, line 2840:  Called elibtoolize
 *   environment, line 1201:  Called die
 * The specific snippet of code:
 *                                   die "Portage patch failed to apply!";
 *
 * If you need support, post the output of `emerge --info '=net-firewall/iptables-1.4.15-r1'`,
 * the complete build log and the output of `emerge -pqv '=net-firewall/iptables-1.4.15-r1'`.
 * The complete build log is located at '/var/tmp/portage/net-firewall/iptables-1.4.15-r1/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/net-firewall/iptables-1.4.15-r1/temp/environment'.
 * Working directory: '/var/tmp/portage/net-firewall/iptables-1.4.15-r1/work/iptables-1.4.15'
 * S: '/var/tmp/portage/net-firewall/iptables-1.4.15-r1/work/iptables-1.4.15'