Hi,

At Thu, 17 Nov 2011 03:24:31 +0900,
Nikolai Weibull wrote in [ruby-core:41079]:
> Why doesn't mkmf's have_macro add a HAVE_X to $defs if the macro is defined?

You can simply use "#ifdef X".  Why do you need a macro just
tells if another macro is defined?

-- 
Nobu Nakada