我在Ubuntu 11上使用easy_install安装lxml有困难。

当我输入$ easy_install lxml时，我得到:

Searching for lxml
Reading http://pypi.python.org/simple/lxml/
Reading http://codespeak.net/lxml
Best match: lxml 2.3
Downloading http://lxml.de/files/lxml-2.3.tgz
Processing lxml-2.3.tgz
Running lxml-2.3/setup.py -q bdist_egg --dist-dir /tmp/easy_install-7UdQOZ/lxml-2.3/egg-dist-tmp-GacQGy
Building lxml version 2.3.
Building without Cython.
ERROR: /bin/sh: xslt-config: not found

** make sure the development packages of libxml2 and libxslt are installed **

Using build configuration of libxslt 
In file included from src/lxml/lxml.etree.c:227:0:
src/lxml/etree_defs.h:9:31: fatal error: libxml/xmlversion.h: No such file or directory
compilation terminated.

似乎没有安装libxslt或libxml2。我试着按照http://www.techsww.com/tutorials/libraries/libxslt/installation/installing_libxslt_on_ubuntu_linux.php和http://www.techsww.com/tutorials/libraries/libxml/installation/installing_libxml_on_ubuntu_linux.php上的说明操作，但没有成功。

如果我试着wget ftp://xmlsoft.org/libxml2/libxml2-sources-2.6.27.tar.gz我得到

<successful connection info>
==> SYST ... done.    ==> PWD ... done.
==> TYPE I ... done.  ==> CWD (1) /libxml2 ... done.
==> SIZE libxml2-sources-2.6.27.tar.gz ... done.
==> PASV ... done.    ==> RETR libxml2-sources-2.6.27.tar.gz ... 
No such file `libxml2-sources-2.6.27.tar.gz'.

如果我先尝试另一个，我会得到。/configure——prefix=/usr/local/libxslt——with-libxml-prefix=/usr/local/libxml2，最终会失败:

checking for libxml libraries >= 2.6.27... configure: error: Could not find libxml2 anywhere, check ftp://xmlsoft.org/.

我尝试了libxml2的2.6.27和2.6.29两个版本，没有什么不同。

不遗余力，我已经成功地完成了sudo apt-get安装libxml2-dev，但这没有改变什么。