apt-get依赖库版本过高问题的解决（如何处理libqt4-dev在ubuntu

因为可能会在项目中应用到Qt的canvas，自然想在自己的VM上先装上来试试，

Nokia现在的SDK太能用了。

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我的ubuntu偶而的会升级一下软件包，结果今天装libqt4-dev时遇到下面的问题，错误提示为：

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apt-get install libqt4-dev Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: libqt4-dev: Depends: libpq-dev but it is not going to be installed Depends: libssl-dev but it is not going to be installed E: Broken packages ?

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再往下一查，发现：

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# apt-get install libpq-dev Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: libpq-dev: Depends: libpq5 (= 8.4.1-1) but 8.4.4-0ubuntu9.10 is to be installed Depends: libssl-dev but it is not going to be installed Depends: libkrb5-dev but it is not going to be installed E: Broken packages ?

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意思就是，虽然我的软件包更新，但是-dev的包就要求是那个旧一点儿的版本。。

怎么解决呢？

网上有个相关的帖子：

http://daway320.blog.163.com/blog/static/3878369920107331733393/

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其中最有用的一句应该是这条命令：

aptitude install libqt4-dbus=4.4.3-1?

这让我想起来可以用这个方法来给各个软件包降级。

比如处理libpq的问题：

apt-get install libpq5=8.4.1-1