ln: /usr/lib/libmysqlclient.18.dylib: File exists

问题

rake aborted!
dlopen(/Users/ava/.rvm/gems/ruby-2.0.0-p247/gems/mysql2-0.3.11/lib/mysql2/mysql2.bundle, 9): Library not loaded: /usr/local/lib/libmysqlclient.18.dylib
  Referenced from: /Users/ava/.rvm/gems/ruby-2.0.0-p247/gems/mysql2-0.3.11/lib/mysql2/mysql2.bundle
  Reason: image not found - /Users/ava/.rvm/gems/ruby-2.0.0-p247/gems/mysql2-0.3.11/lib/mysql2/mysql2.bundle`

Ran the following to resolve:

$ sudo ln -s /usr/local/mysql/lib/libmysqlclient.18.dylib \
             /usr/lib/libmysqlclient.18.dylib
ln: /usr/lib/libmysqlclient.18.dylib: File exists

My setup:

• OSX 10.8.4
• MySQL 5.1.71

• libmysqlclient.16.dylib

  $ locate libmysqlclient.16.dylib
  /usr/lib/libmysqlclient.16.dylib
  /usr/local/Cellar/mysql51/5.1.71/lib/mysql/libmysqlclient.16.dylib
  

• libmysqlclient.18.dylib

  $ locate libmysqlclient.18.dylib
  /usr/lib/libmysqlclient.18.dylib
  

In .bash_profile, I have

export PATH="/usr/local/bin:$HOME/.rvm/bin:$HOME/bin:$PATH"
export DYLD_LIBRARY_PATH=/usr/local/bin/mysql

How to get this rake running? Am I supposed to have libmysqlclient.18.dylib under /usr/local/Cellar/mysql51/5.1.71/lib/mysql too? If yes, how do I create it?

回答1:

Sorry, if I am mistaken; there is no Mac to check in details.

The error message clearly states, that the library mysql wants is:

/usr/local/lib/libmysqlclient.18.dylib

while the library you have is:

/usr/lib/libmysqlclient.18.dylib

That definitely means, that your mysql installation is somehow broken, but for the quick patch I would recommend soft linking:

$ sudo ln -s /usr/lib/libmysqlclient.18.dylib /usr/local/lib/libmysqlclient.18.dylib

You have likely misplaced arguments within your first solution try.

回答2:

Instruct Mac OS X to find it as follows, if you are using Bash:

In your ~/.bash_profile:

export DYLD_LIBRARY_PATH=<location of mysqlclient.18.dylib>:$DYLD_LIBRARY_PATH

Restart terminal.

For example, I have the following:

$ ls -ld /usr/local/m*
lrwxr-xr-x   1 root  admin   27 May  5 14:28 /usr/local/mysql -> mysql-5.6.13-osx10.7-x86_64
drwxr-xr-x   3 root  wheel  102 May  5 13:13 /usr/local/mysql-5.5.29-osx10.6-x86
drwxr-xr-x  17 root  wheel  578 May  5 13:13 /usr/local/mysql-5.6.13-osx10.7-x86_64

$ head ~/.bash_profile
export DYLD_LIBRARY_PATH=/usr/local/mysql/lib:$DYLD_LIBRARY_PATH

来源：https://stackoverflow.com/questions/18388864/ln-usr-lib-libmysqlclient-18-dylib-file-exists