+AC_ARG_ENABLE([warnings-as-errors], AS_HELP_STRING([--enable-warnings-as-errors],
+ [Build with -Werror enabled]), , [enable_warnings_as_errors=no])
+AC_CACHE_CHECK([if all warnings should produce an error], [ac_cv_warnings_as_errors], [
+ AS_IF([test "x$enable_warnings_as_errors" = "xyes"], [
+ ac_cv_warnings_as_errors=yes
+ ], [
+ ac_cv_warnings_as_errors=no
+ ])
+])
+