总是显示一下内容，而且emerge XXX不工作。添加了use后用--newuse也不工作。
NOTE: The --autounmask-keep-masks option will prevent emerge
from creating package.unmask or ** keyword changes.
Use --autounmask-write to write changes to config files (honoring CONFIG_PROTECT).
* IMPORTANT: 1 news items need reading for repository 'gentoo_prefix'.
* Use eselect news to read news items.
NOTE: The --autounmask-keep-masks option will prevent emerge
from creating package.unmask or ** keyword changes.
Use --autounmask-write to write changes to config files (honoring CONFIG_PROTECT).
* IMPORTANT: 1 news items need reading for repository 'gentoo_prefix'.
* Use eselect news to read news items.
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