From: Glenn Morris <rgm@gnu.org>
Date: Sun, 31 May 2015 23:27:36 +0000 (-0700)
Subject: * src/emacs.c (syms_of_emacs) <system-configuration-features>: Doc fix.
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* src/emacs.c (syms_of_emacs) <system-configuration-features>: Doc fix.
---

diff --git a/src/emacs.c b/src/emacs.c
index 70db900246a..bba68068a83 100644
--- a/src/emacs.c
+++ b/src/emacs.c
@@ -2434,7 +2434,10 @@ hpux, irix, usg-unix-v) indicates some sort of Unix system.  */);
   DEFVAR_LISP ("system-configuration-features", Vsystem_configuration_features,
 	       doc: /* String listing some of the main features this Emacs was compiled with.
 An element of the form \"FOO\" generally means that HAVE_FOO was
-defined during the build.  */);
+defined during the build.
+
+This is mainly intended for diagnostic purposes in bug reports.
+Don't rely on it for testing whether a feature you want to use is available.  */);
   Vsystem_configuration_features = build_string (EMACS_CONFIG_FEATURES);
 
   DEFVAR_BOOL ("noninteractive", noninteractive1,