could not locate the pod2man program.

xiyang

1. [root@mail Mail-SpamAssassin-2.63]# perl Makefile.PL
   
2. What email address or URL should be used in the suspected-spam report
   
3. text for users who want more information on your filter installation?
   
4. (In particular, ISPs should change this to a local Postmaster contact)
   
5. default text: [the administrator of that system]
   
6. 
   
7. 
   
8. Warning: I could not locate your pod2man program. Please make sure,
   
9. your pod2man program is in your PATH before you execute 'make'
   
10. 
    
11. Writing Makefile for Mail::SpamAssassin
    
12. Makefile written by ExtUtils::MakeMaker 6.05
    
13. [root@mail Mail-SpamAssassin-2.63]# locate pod2man
    
14. /usr/bin/pod2man
    
15. /usr/share/man/man1/pod2man.1.gz
    
16. [root@mail Mail-SpamAssassin-2.63]# echo $PATH
    
17. /usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/X11R6/bin:/root/bin
    

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请问大概是什么原因?
thanks