In servconf.c, the code segment...

char *
derelativise_path(const char *path)
{
        char *expanded, *ret, *cwd;

        expanded = tilde_expand_filename(path, getuid());
        if (*expanded == '/')
                return expanded;
        if ((cwd = getcwd(NULL, 0)) == NULL)
                fatal("%s: getcwd: %s", __func__, strerror(errno));
        xasprintf(&ret, "%s/%s", cwd, expanded);
        xfree(cwd);
        xfree(expanded);
        return ret;
}

is calling getcwd(NULL, 0).  In the man pages from Solaris, is says...

ERRORS
     The getcwd() function will fail if:

     EINVAL          The size argument is equal to 0.

I suspect that this should be PATH_MAX, rather then 0.  This routine, and hence the error, does not exist in 5.3p1.