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build: document WERROR_CFLAGS

* README-hacking: Mention 'make WERROR_CFLAGS='.
Paul Eggert 3 years ago
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README-hacking

@@ -14,6 +14,10 @@ version.
 - Texinfo <http://www.gnu.org/software/texinfo>
 - Git <http://git.or.cz>
 
+Up-to-date compilers and libraries are also recommended, for better
+static checking.  You may be able to use an older compiler by building
+with 'make WERROR_CFLAGS='; if so, don't worry about its false alarms.
+
 * Bootstrapping
 
 Obviously, if you are reading these notes, you did manage to clone