mac下开发环境的常见问题解决方法

brew的库版本冲突：

I have a few kegs of the same package in /usr/local/Cellar/libfoo like /usr/local/Cellar/libfoo/1.0.1, /usr/local/Cellar/libfoo/HEAD and /usr/local/Cellar/libfoo/mycopy

How can I brew link to a specific version?

问题解决方法：

The usage info:

Usage: brew switch  

Example:

brew switch mysql 5.5.29

You can find the versions installed on your system with info.

brew info mysql

And to see the available versions to install, you can provide a dud version number, as brew will helpfully respond with the available version numbers:

brew switch mysql 0

---

Update (15.10.2014):

The brew versions command has been removed from brew, but, if you do wish to use this command first run brew tap homebrew/boneyard.

The recommended way to install an old version is to install from the homebrew/versions repo as follows:

$ brew tap homebrew/versions
$ brew install mysql55

brew 的 link问题

$ brewinstall erlangError: You must `brew link libtool' before erlang can be installedzhi:~ zhi$ brew link libtoolLinking /usr/local/Cellar/libtool/2.4.2... Error: Could not symlink include/ltdl.h/usr/local/include is not writable.

运行brew doctor，把它报的错先搞定，重复这个过程，直到它不报错为止。

PS.话说上面的出错提示信息不是已经很明显了么？如果你是管理员用户，先跑一下sudo chmod -R g+w /usr/local

• 2014年05月14日回答 
• 11 评论

Windoze 9.1k 声望

答案对人有帮助，有参考价值 0 答案没帮助，是错误的答案，答非所问

You can do:
sudo chown -R whoami /usr/local
brew link libtool

• 2014年07月24日回答 
• 评论

ayuwxf 1 声望

答案对人有帮助，有参考价值 0 答案没帮助，是错误的答案，答非所问

sudo brew install erlang
因为brew在安装文件的时候需要root权限，命令前面加上sudo就好了
命令在回车后会让你输入你当前用户的密码，输入然后回车就行了

如果依然不行，也可能是读写权限问题，看一下相关目录下的读写权限，确定问题出在哪再说

brew link mysql did not complete

For some some reason brew does not link mysql and it complains about permission. I chmod the folder to 777 but I am still have the same issues

  laptop$ brew install mysql 

Error:

 mysql-5.5.27 already installed, it's just not linked

 laptop$ brew link mysql

 Linking /usr/local/Cellar/mysql/5.5.27... Warning: Could not link mysql. 

Unlinking...

    Error:
    Could not symlink file: /usr/local/Cellar/mysql/5.5.27/lib/plugin
    /usr/local/lib is not writable. You should change its permissions.

解决：

sudo chown -R $(whoami) /usr/local/lib/

编译问题： cannot compute suffix of object files: 

configure: error: cannot compute suffix of object files: cannot compile

需要将mpc、gmp和mpfr目录加入到环境变量中，在/etc/profile文件末尾加上：export  LD_LIBRARY_PATH =$ LD_LIBRARY_PATH :/usr/local/mpc-0.8.1/lib:/usr/local/gmp-5.0.1/lib:/usr/local/mpfr-3.0.0/lib，注意修改目录，之后运行#source /etc/profile使其生效即可

brew link

mac 安装opencv之后的cmake find package 的引用问题

By not providing "FindOpenCV.cmake" in CMAKE_MODULE_PATH this project has

  asked CMake to find a package configuration file provided by "OpenCV", but

  CMake did not find one.

  Could not find a package configuration file provided by "OpenCV" with any

  of the following names:

    OpenCVConfig.cmake

    opencv-config.cmake

  Add the installation prefix of "OpenCV" to CMAKE_PREFIX_PATH or set

  "OpenCV_DIR" to a directory containing one of the above files.  If "OpenCV"

  provides a separate development package or SDK, be sure it has been

  installed.

mac终端使用快捷键，终端中回行首，行尾

在Mac系统中并没有Home、End等键，所以在使用时并不是特别的顺手，但是有几个键位组合可以使Terminal的操作更加灵活方便。

1、将光标移动到行首：ctrl + a

2、将光标移动到行尾：ctrl + e

3、清除屏幕：                ctrl + l

4、搜索以前使用命令：ctrl + r

5、清除当前行：            ctrl + u

6、清除至当前行尾：    ctrl + k

7、单词为单位移动：option + 方向键