如何從portage中刪除set

我正在處理很多 Qt5 塊。

[blocks B      ] <dev-qt/qtgui-4.8.6:4 ("<dev-qt/qtgui-4.8.6:4" is blocking dev-qt/qtchooser-0_p20150102)
[blocks B      ] <dev-qt/qtsql-4.8.6:4 ("<dev-qt/qtsql-4.8.6:4" is blocking dev-qt/qtchooser-0_p20150102)
[blocks B      ] <dev-qt/qtcore-4.8.6:4 ("<dev-qt/qtcore-4.8.6:4" is blocking dev-qt/qtchooser-0_p20150102)
[blocks B      ] <dev-qt/qtopengl-4.8.6:4 ("<dev-qt/qtopengl-4.8.6:4" is blocking dev-qt/qtchooser-0_p20150102)
[blocks B      ] <dev-qt/qt3support-4.8.6:4 ("<dev-qt/qt3support-4.8.6:4" is blocking dev-qt/qtchooser-0_p20150102)
[blocks B      ] <dev-qt/qtscript-4.8.6:4 ("<dev-qt/qtscript-4.8.6:4" is blocking dev-qt/qtchooser-0_p20150102)
[blocks B      ] <dev-qt/qttest-4.8.6:4 ("<dev-qt/qttest-4.8.6:4" is blocking dev-qt/qtchooser-0_p20150102)
[blocks B      ] <dev-qt/qtphonon-4.8.6:4 ("<dev-qt/qtphonon-4.8.6:4" is blocking dev-qt/qtchooser-0_p20150102)
[blocks B      ] <dev-qt/qtxmlpatterns-4.8.6:4 ("<dev-qt/qtxmlpatterns-4.8.6:4" is blocking dev-qt/qtchooser-0_p20150102)
[blocks B      ] <dev-qt/qtwebkit-4.8.6:4 ("<dev-qt/qtwebkit-4.8.6:4" is blocking dev-qt/qtchooser-0_p20150102)
[blocks B      ] <dev-qt/qtdbus-4.8.6:4 ("<dev-qt/qtdbus-4.8.6:4" is blocking dev-qt/qtchooser-0_p20150102)
[blocks B      ] <dev-qt/qtsvg-4.8.6:4 ("<dev-qt/qtsvg-4.8.6:4" is blocking dev-qt/qtchooser-0_p20150102)

 (dev-qt/qtchooser-0_p20150102:0/0::gentoo, ebuild scheduled for merge) pulled in by
   dev-qt/qtchooser required by (dev-qt/qtpositioning-5.4.0:5/5::gentoo, ebuild scheduled for merge)
   dev-qt/qtchooser required by (dev-qt/qtgraphicaleffects-5.4.0:5/5::gentoo, ebuild scheduled for merge)
   dev-qt/qtchooser required by (dev-qt/qtcore-5.4.0:5/5::gentoo, ebuild scheduled for merge)
 ...

但是我沒有安裝qt5（可能被一一刪除-我前段時間試圖解決它）：

# equery list qt*-5*
* Searching for qt*-5* ...
!!! No installed packages matching 'qt*-5*'

我什至添加-qt5了 USE 標誌。

我記得我使用了一些 qt5 集，emerge --ask @qt5-essentials @qt5-addons並且列表集證實了這一點。

# emerge --list-sets
...
qt5-addons
qt5-essentials
qt5-tools

但我找不到任何方法來擺脫它們 - 沒有出現選項。並且自定義集目錄不存在：

# ls /etc/portage/sets/
ls: cannot access /etc/portage/sets/: No such file or directory

AFAIK 沒有命令。

檢查/var/lib/portage/world_sets揭示真相:)

# cat  /var/lib/portage/world_sets
@qt5-addons
@qt5-essentials

刪除後，完整更新 (@world) 不再抱怨。

下次先檢查man emerge，開始時會提到集合：

set    A set is a convenient shorthand for a large group of packages. Three sets are currently always available: selected, system and world. selected contains the user-selected  "world"  packages  that  are
      listed  in /var/lib/portage/world, and nested sets that may be listed in /var/lib/portage/world_sets. system refers to a set of packages deemed necessary for your system to run properly. world encom‐
      passes both the selected and system sets. [See FILES below for more information.] Other sets can exist depending on the current  configuration.  The  default  set  configuration  is  located  in  the
      /usr/share/portage/config/sets  directory.   User  sets  may  be  created  by placing files in the /etc/portage/sets/ directory (see portage(5)). Note that a set is generally used in conjunction with
      --update. When used as arguments to emerge sets have to be prefixed with @ to be recognized. Use the --list-sets action to display a list of available package sets.

引用自：https://unix.stackexchange.com/questions/185750