emerge portage时遇到问题~

hoker_long

我的portage很老了：
# emerge --version  
Portage 2.1.2.2 (default/linux/amd64/10.0, gcc-4.1.1, glibc-2.5-r0, 2.6.20-gentoo-r8 x86_64)

今天想装iotop的时候发现问题：
Calculating dependencies -
!!! All ebuilds that could satisfy "iotop" have been masked.
!!! One of the following masked packages is required to complete your request:
- sys-process/iotop-0.2.1 (masked by: required EAPI 2, supported EAPI 0)
- sys-process/iotop-0.3.2-r1 (masked by: required EAPI 2, supported EAPI 0)

于是计划升级portage：
# emerge portage
Calculating dependencies -
!!! All ebuilds that could satisfy ">=dev-lang/python-2.5" have been masked.
!!! One of the following masked packages is required to complete your request:
- dev-lang/python-2.5.4-r3 (masked by: required EAPI 1, supported EAPI 0)
- dev-lang/python-2.6.2-r1 (masked by: required EAPI 2, supported EAPI 0)
- dev-lang/python-2.6.2-r2 (masked by: required EAPI 2, supported EAPI 0)
- dev-lang/python-2.6.4 (masked by: required EAPI 2, supported EAPI 0)
- dev-lang/python-3.1.1-r1 (masked by: required EAPI 2, supported EAPI 0)
- dev-lang/python-2.6.3 (masked by: required EAPI 2, supported EAPI 0)

For more information, see MASKED PACKAGES section in the emerge man page or
refer to the Gentoo Handbook.
(dependency required by "sys-apps/portage-2.1.6.13" [ebuild])


似乎进入死循环了，我该怎么办呢？谢谢各位了~