checklink.pl fails: missing sys/syscall.ph?

From: David M. Karr (david.karr@cacheflow.com)
Date: Mon, May 14 2001

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    Message-ID: <3AFFF8A7.C156DFFD@cacheflow.com>
    Date: Mon, 14 May 2001 08:24:23 -0700
    From: "David M. Karr" <david.karr@cacheflow.com>
    To: www-validator@w3.org
    Subject: checklink.pl fails: missing sys/syscall.ph?
    
    Hello.  I'm trying to set up checklink.pl to validate the links of some
    generated HTML.  I've downloaded all of the packages that there were
    unresolved references for, and now I'm left with the following
    checklink.pl output (html output hacked so a browser won't get
    confused):
    
    ------------------------------------
    [Fri May 11 17:11:20 2001] checklink.pl: Unrecognized escape \s passed
    through at ./checklink.pl line 1800.
    [Fri May 11 17:11:20 2001] checklink.pl: W3C::CheckLink::urize() called
    too early to check prototype at ./checklink.pl line 100.
    Content-type: text/html
    
    Software error:
    Can't locate sys/syscall.ph in @INC (did you run h2ph?) (@INC contains:
    /usr/lib/perl5/5.6.1/cygwin /usr/lib/perl5/5.6.1
    /usr/lib/perl5/site_perl/5.6.1/cygwin /usr/lib/perl5/site_perl/5.6.1
    /usr/lib/perl5/site_perl .) at ./checklink.pl line 1200.
    
    For help, please send mail to this site's webmaster, giving this error
    message
    and the time and date of the error.
    
    [Fri May 11 17:11:20 2001] checklink.pl: Can't locate sys/syscall.ph in
    @INC (did you run h2ph?) (@INC contains: /usr/lib/perl5/5.6.1/cygwin
    /usr/lib/perl5/5.6.1 /usr/lib/perl5/site_perl/5.6.1/cygwin
    /usr/lib/perl5/site_perl/5.6.1 /usr/lib/perl5/site_perl .) at
    ./checklink.pl line 1200.
    --------------------------------
    
    I'm now trying to resolve "sys/syscall.ph".  I can't find this anywhere
    on CPAN or the main Perl web site.  I haven't looked at the other
    warnings yet.  I just tried to run it on a trivial web page that has a
    link to a nonexistent page.