ebuild-vars.tex: Clarify which variables can be defined by an eclass

Signed-off-by: Ulrich Müller <ulm@gentoo.org>

1 files changed, 5 insertions, 2 deletions

diff --git a/ebuild-vars.tex b/ebuild-vars.tex
index d07cca4..e7aab0a 100644
--- a/ebuild-vars.tex
+++ b/ebuild-vars.tex
@@ -43,8 +43,9 @@ All ebuilds must define at least the following variables:
 \section{Optional Ebuild-defined Variables}
 \label{sec:optional-vars}
 
-Ebuilds may define any of the following variables:
-\nobreakpar
+Ebuilds may define any of the following variables. Unless otherwise stated, any of them may be
+defined by an eclass.
+
 \begin{description}
 \item[EAPI] The EAPI\@. See below in section~\ref{sec:eapi}.
 \item[HOMEPAGE] The URI or URIs for a package's homepage, including protocols.
@@ -147,6 +148,8 @@ EAPI, the package manager must make sure that the \t{EAPI} value obtained by sou
 with bash is identical to the EAPI obtained by parsing. The ebuild must be treated as invalid if
 these values are different.
 
+Eclasses must not attempt to modify the \t{EAPI} variable.
+
 \subsection{SRC_URI}
 \label{sec:src-uri-behaviour}