+
+This file contains various variables that are used by Portage. The file has a
+newline\-delimited list of \fI<key>=<value>\fR pairs (see the default file for
+examples) which are accessible from the environment of ebuilds. It supports
+simple shell\-like expansion of the form \fIvar="${var}"\fR, the source
+keyword and variable substitution, but not some of the more advanced BASH
+features like arrays and special parameter expansions. For more details, see
+the Simple lexical analysis documentation:
+\fLhttp://docs.python.org/3/library/shlex.html\fR. Note that if you source
+files, they need to be in the same shlex syntax for portage to read them.
+.br