安装psql遇到的连接问题 Could not symlink include/ecpg_config.h

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1、brew install postgresql 之后有如下错误：

==> Pouring postgresql-9.6.3.yosemite.bottle.tar.gzError: The `brew link` step did not complete successfullyThe formula built, but is not symlinked into /usr/localCould not symlink include/ecpg_config.h/usr/local/include is not writable.You can try again using:  brew link postgresql==> Using the sandbox==> /usr/local/Cellar/postgresql/9.6.3/bin/initdb /usr/local/var/postgresLast 15 lines from /Users/langxw/Library/Logs/Homebrew/postgresql/post_install.01.initdb:2017-07-24 07:51:52 +0800

2、根据提示执行brew link postgresql之后

brew link --overwrite postgresqlLinking /usr/local/Cellar/postgresql/9.6.3... Error: Could not symlink include/ecpg_config.h/usr/local/include is not writable.

提示信息：缺少symlink ecpg_config.h 和缺少写权限。

3、解决方法：

1）添加权限/usr/local是添加些权限

2）添加link

/usr/local$ ln -s /usr/local/Cellar/postgresql/9.6.3/include/ecpg_config.h ecpg_config.h

3）重新执行 brew link postgresql

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