Missing content when parsing html

[lixing123]

hi,
first thank you for hpple. It helps a lot.

Recently when I use hpple to parse a html file, the content, which should have something in it, is null.
Here is part of the html file:

        发信人:
            znslm
            (小白), 信区: Pictures 标 题: Re: 你十六岁喜欢的那个人怎么样了？发信站: 南京大学小百合站 (Mon Nov 7 21:49:51 2011)    小孩上小学了
            
            
            
            喜欢我的那位呢/ 我猜的 --
        
        

the xpath string is "://tr/td/pre/a" the result is supposed to be "znslm", but it's null. how to fetch the string?

[lixing123]

the problem is that hpple seems cannot parse "pre" tag. It missed everything associated with the tag.

[samniu]

fatal error: 'libxml/tree.h' file not found [2]