[WARN_CFLAGS],
[-Werror])
+# When given, add -Werror to WARN_CFLAGS.
+AC_ARG_ENABLE([Werror],
+ [AS_HELP_STRING([--enable-Werror], [Treat compiler warnings as errors.])]
+)
+AS_IF([test "x$enable_Werror" = "xyes"],
+ [WARN_CFLAGS="${WARN_CFLAGS} -Werror"]
+)
+
# Checks for programs.
AC_PROG_GREP
AC_PROG_MAKE_SET