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#include <u.h>
#include <libc.h>

void
perror(char *s)
{
        char buf[ERRMAX];

        buf[0] = '\0';
        errstr(buf, sizeof buf);
        if(s && *s)
                fprint(2, "%s: %s\n", s, buf);
        else
                fprint(2, "%s\n", buf);
}