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diff XSUB.h.orig XSUB.h
141c141
< #    define XS_EXTERNAL(name) void name(pTHX_ CV* cv __attribute__un
+used__)
---
> #    define XS_EXTERNAL(name) name(pTHX_ CV* cv __attribute__unused_
+_)

use warnings;
use strict;
...
    pinMode(1, INPUT);
    printf("hello, world!\n");
}