终于好了。搞到转钟3点都没搞定，耽误不少时间.
执行sudo port install dpkg
报错如下
Error: org.macports.build for port gmp returned: command execution failed
Error: Failed to install gmp
Please see the log file for port gmp for details:
/opt/local/var/macports/logs/_opt_local_var_macports_sources_www.macports.org_files_ports_devel_gmp/gmp/main.log
Error: The following dependencies were not installed: coreutils gmp gnutar help2man p5.16-locale-gettext perl5.16 gdbm perl5 xz zlib
To report a bug, follow the instructions in the guide:
http://guide.macports.org/#project.tickets
Error: Processing of port dpkg failed
提示的gmp安装失败，dpkg缺少后面这么多依赖没装。于是我就准备手动安装一个个依赖
查看dpkg包依赖
xiongwj:~ luojin$ sudo port deps dpkg
Full Name: dpkg @1.14.29_4
Build Dependencies: gmake
Library Dependencies: gettext, libiconv, perl5, coreutils, bzip2, zlib
Runtime Dependencies: gnutar, xz
使用安装命令安装各个依赖包
顺利安装完gnutar , xz，perl5之后
coreutils依赖需要gmp，结果gmp安装失败。
找到问题根源就是gmp安装不了。
其实之前装dpkg的时候就已经报了gmp安装失败的提示，蛋疼 又绕回来了。
Error: org.macports.build for port gmp returned: command execution failed
Please see the log file for port gmp for details:
/opt/local/var/macports/logs/_opt_local_var_macports_sources_distfiles.macports.org_ports_devel_gmp/gmp/main.log
To report a bug, follow the instructions in the guide:
http://guide.macports.org/#project.tickets
Error: Processing of port gmp failed
查看日志main.log
:info:build /Volumes/Xcode 5.1/Xcode.app/Contents/Developer/usr/bin/make all-recursive
:info:build make: /Volumes/Xcode: No such file or directory
:info:build make: *** [all] Error 1
:info:build make: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_distfiles.macports.org_ports_devel_gmp/gmp/work/gmp-6.0.0'
:info:build Command failed: cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_distfiles.macports.org_ports_devel_gmp/gmp/work/gmp-6.0.0" && /usr/bin/make -j4 -w all
:info:build Exit code: 2
:error:build org.macports.build for port gmp returned: command execution failed
:debug:build Error code: CHILDSTATUS 43636 2
:debug:build Backtrace: command execution failed
安装多个xcode的同学，选一个指定的xcode复制到Applications目录下，然后重新指定以下。
xcode-select -switch /Applications/Xcode.app/Contents/Developer
export DEVELOPER_DIR="/Applications/Xcode.app/Contents/Developer"
再然后开始sudo port install gmp
还是失败，
尝试了很多方法还是安装失败，后来谷歌百度搜索“gmp安装”找到如下安装教程
http://www.cnblogs.com/math-mao/archive/2013/05/15/3080181.html
首先，去libgmp官网下载最新的gmp包。（我下的是gmp-6.0.0）
然后gmp-6.0.0.tar.bz2。使用命令，也可以直接解压
进入gmp-6.0.0文件夹
接下来比较关键，在使用configure的时候要加上 --enable-cxx命令，否则不能使用c++库gmpxx.h
然后
最后
就安装完成了。
也就是下载代码，自己make编译，然后安装。成功。接下来安装dpkg
执行sudo port install dpkg
终于安装成功了。以前装的时候是那么的顺利,这次比较曲折，记录一下。