future versions.
- sets can be referenced either in other file-based sets or as argument to emerge, but
not in ebuilds, config files or other tools at this time.
+* "world" does no longer include "system" unconditionally, but you can add
+ "@system" to the worldfile to restore the old state.
portage-2.1.4.1
==================================
.SH "SYNOPSIS"
.TP
.BR emerge
-[\fIoptions\fR] [\fIaction\fR] [\fIebuild\fR | \fItbz2file\fR | \fIset\fR | \fIatom\fR] ...
+[\fIoptions\fR] [\fIaction\fR] [\fIebuild\fR | \fItbz2file\fR | \fI@set\fR | \fIatom\fR] ...
.TP
.BR emerge
\fB\-\-sync\fR | \fB\-\-version\fR
.TP
.BR set
A \fIset\fR is a convenient shorthand for a large group of
-packages. Two sets are currently supported: \fBsystem\fR
+packages. Two sets are currently always available: \fBsystem\fR
and \fBworld\fR. \fBsystem\fR refers to a set of packages
-deemed necessary for your system to run properly. \fBworld\fR
-contains all the packages in \fBsystem\fR, plus any
-other packages listed in \fB/var/lib/portage/world\fR. [See
-\fBFILES\fR below for more information.] Note that a \fIset\fR
-is generally used in conjunction with \fB\-\-update\fR.
+deemed necessary for your system to run properly. \fBworld\fR
+contains all the packages listed in \fB/var/lib/portage/world\fR. [See
+\fBFILES\fR below for more information.] Other sets can exist depending
+on the current configuration. Note that a \fIset\fR
+is generally used in conjunction with \fB\-\-update\fR. When used as
+arguments to \fBemerge\fR sets have to be prefixed with \fB@\fR to be
+recognized.
.TP
.BR atom
An \fIatom\fR describes bounds on a package that you wish to install.