Gentoo/emerge

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emerge

Pretend to install a package:

emerge --pretend <package>

Install a package:

emerge --ask <package>

Uninstall:

emerge --ask --unmerge <package>

Search:

emerge --search <package>

View changelog:

emerge --pretend --changelog <package>

Sometimes a package cannot be installed, because it is masked:

$ emerge cachefilesd
Calculating dependencies... done!
[ebuild  N    ~] sys-fs/cachefilesd-0.10.5  USE="-doc (-selinux)"
The following keyword changes are necessary to proceed:
#required by cachefilesd (argument)
=sys-fs/cachefilesd-0.10.5 ~x86
Use --autounmask-write to write changes to config files (honoring CONFIG_PROTECT).

We can force emerge to install from the testing branch (marked with a "~"):

$ ACCEPT_KEYWORDS="~x86" emerge cachefilesd
>>> Emerging (1 of 1) sys-fs/cachefilesd-0.10.5
>>> Installing (1 of 1) sys-fs/cachefilesd-0.10.5
[...]

Clean up distfiles:

eclean distfiles

ebuild

TBD...

eselect

TBD...

Troubleshooting

gcc-config: Active gcc profile is invalid!

This happened:

$ gcc --version
* gcc-config: Active gcc profile is invalid!
gcc-config: error: could not run/locate 'gcc'

The trick was to:

$ gcc-config -l
* gcc-config: Active gcc profile is invalid!

[1] i686-pc-linux-gnu-4.6.3

$ gcc-config i686-pc-linux-gnu-4.6.3
$ . /etc/profile
$ emerge gcc
>>> Emerging (1 of 1) sys-devel/gcc-4.6.3
[...]

The following USE changes are necessary to proceed

This happened:

$ emerge --autounmask sci-visualization/gnuplot
Calculating dependencies... done!
[ebuild   R    ] media-libs/gd-2.0.35-r3  USE="png*"
[ebuild  N     ] sci-visualization/gnuplot-4.6.1  USE="gd readline -X -bitmap \
                 -cairo -doc -emacs -examples -ggi -latex -lua -plotutils -qt4 \
                 -svga -thin-splines -wxwidgets -xemacs"

The following USE changes are necessary to proceed:
#required by sci-visualization/gnuplot-4.6.1[gd], required by sci-visualization/gnuplot (argument)
>=media-libs/gd-2.0.35-r3 png

Use --autounmask-write to write changes to config files (honoring CONFIG_PROTECT).

The solution was to add the proposed line to /etc/portage/package.use/media-libs:

=media-libs/gd-2.0.35-r3 png

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