如何用PHP 5.5在Debian 7上安装php5-memcached？

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我在Debian 7 VirtualBox VM上安装PHP 5 Memcached模块的尝试失败了：

root@testvm:~# apt-get install php5-memcached
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:
 php5-memcached : Depends: libmemcached11 but it is not installable
E: Unable to correct problems, you have held broken packages.

我也无法在Synaptic Package Manager上安装它.

我猜,问题可能在于/etc/apt/sources.list中缺少的源信息.

更新：

的/etc/apt/sources.list

# deb cdrom:[Debian GNU/Linux 7.1.0 _Wheezy_ - Official amd64 NETINST Binary-1 20130615-23:04]/ wheezy main

# deb cdrom:[Debian GNU/Linux 7.1.0 _Wheezy_ - Official amd64 NETINST Binary-1 20130615-23:04]/ wheezy main

deb http://ftp.de.debian.org/debian/ wheezy main contrib non-free
deb-src http://ftp.de.debian.org/debian/ wheezy main contrib non-free

deb http://security.debian.org/ wheezy/updates main contrib non-free
deb-src http://security.debian.org/ wheezy/updates main contrib non-free

# wheezy-updates, previously known as 'volatile'
deb http://ftp.de.debian.org/debian/ wheezy-updates main contrib non-free
deb-src http://ftp.de.debian.org/debian/ wheezy-updates main contrib non-free

# nginx
deb http://packages.dotdeb.org wheezy all
deb-src http://packages.dotdeb.org wheezy all

# PHP 5.5
deb http://packages.dotdeb.org wheezy-php55 all
deb-src http://packages.dotdeb.org wheezy-php55 all

更新：

我尝试手动安装缺少的依赖项,但它也不起作用：

root@devvm:~# apt-get install libmemcached11
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package libmemcached11 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'libmemcached11' has no installation candidate

更新：

root@devvm:~# apt-cache depends php5-memcached libmemcached10
php5-memcached
  Depends: libc6
  Depends: <libmemcached11>
  Depends: zlib1g
  Depends: <phpapi-20121212>
    libapache2-mod-php5filter
    libapache2-mod-php5
    libphp5-embed
    php5-cgi
    php5-cli
    php5-fpm
  Depends: php5-common
 |PreDepends: dpkg
  PreDepends: <dpkg-maintscript-helper>
libmemcached10
  Depends: libc6
  Depends: libgcc1
  Depends: libstdc++6
  PreDepends: multiarch-support
  Conflicts: <libmemcached2>
  Conflicts: <libmemcached3>
  Conflicts: <libmemcached6>
  Conflicts: <libmemcached9>

解决方法:

要解决您的问题,您只需将以下内容添加到sources.list：

# Wheezy
deb http://ftp.hosteurope.de/mirror/packages.dotdeb.org/ wheezy all
deb-src http://ftp.hosteurope.de/mirror/packages.dotdeb.org/ wheezy all

# Wheezy-php55
deb http://ftp.hosteurope.de/mirror/packages.dotdeb.org/ wheezy-php55 all
deb-src http://ftp.hosteurope.de/mirror/packages.dotdeb.org/ wheezy-php55 all

实际上,缺少的依赖项(libmemcached11)存在于dotdeb存储库的wheezy发行版中.

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