common/autoconf/flags.m4

*** 946,953 ****
--- 946,958 ----
      clang)
        DISABLE_WARNING_PREFIX="-Wno-"
        CFLAGS_WARNINGS_ARE_ERRORS="-Werror"
        ;;
    esac
+ 
+   if test "x$enable_warnings_as_errors" = "xno"; then
+     CFLAGS_WARNINGS_ARE_ERRORS=""
+   fi
+ 
    AC_SUBST(DISABLE_WARNING_PREFIX)
    AC_SUBST(CFLAGS_WARNINGS_ARE_ERRORS)
  ])