升级perl后的问题

>uname -a
FreeBSD mybsd.zsoft.com 8.0-RELEASE-p2 FreeBSD 8.0-RELEASE-p2 #0: Wed Jul 14 15:35:26 CST 2010     [email protected]:/media/G/usr/obj/media/G/usr/src/sys/MYKERNEL  i386

>sudo env DISABLE_CONFLICTS=1 portupgrade -o lang/perl5.12 -f perl-5.8.\*

>pkg_info |grep -i perl
perl-5.12.1_1       Practical Extraction and Report Language

>sudo portupgrade -fr perl
Password:
** Makefile possibly broken: mail/thunderbird:
        grep: write error: Broken pipe
        thunderbird-2.0.0.24_1
      
      
/usr/local/sbin/portupgrade:1473:in `get_pkgname': Makefile broken (MakefileBrokenError)
        from /usr/local/sbin/portupgrade:623
        from /usr/local/sbin/portupgrade:614:in `each'
        from /usr/local/sbin/portupgrade:614
        from /usr/local/sbin/portupgrade:588:in `catch'
        from /usr/local/sbin/portupgrade:588
        from /usr/local/lib/ruby/1.8/optparse.rb:1310:in `call'
        from /usr/local/lib/ruby/1.8/optparse.rb:1310:in `parse_in_order'
        from /usr/local/lib/ruby/1.8/optparse.rb:1306:in `catch'
        from /usr/local/lib/ruby/1.8/optparse.rb:1306:in `parse_in_order'
        from /usr/local/lib/ruby/1.8/optparse.rb:1254:in `catch'
        from /usr/local/lib/ruby/1.8/optparse.rb:1254:in `parse_in_order'
        from /usr/local/lib/ruby/1.8/optparse.rb:1248:in `order!'
        from /usr/local/lib/ruby/1.8/optparse.rb:1241:in `order'
        from /usr/local/sbin/portupgrade:565:in `main'
        from /usr/local/lib/ruby/1.8/optparse.rb:791:in `initialize'
        from /usr/local/sbin/portupgrade:229:in `new'
        from /usr/local/sbin/portupgrade:229:in `main'
        from /usr/local/sbin/portupgrade:2213

What does this errror mean ?

5.12没用过,5.10没问题.