How to Fix \'Library not loaded: libmysqlclient.18.dylib\' in Rails on macOS?

Rails MySQL on macOS: Resolving "Library not loaded: libmysqlclient.18.dylib" Issue

As the error message indicates, the "libmysqlclient.18.dylib" library used by MySQL2 gem is missing. Here's how to resolve this problem:

Locate the Missing Library

The file you need, "libmysqlclient.18.dylib," should be available at "/usr/local/mysql/lib/libmysqlclient.18.dylib." If not, ensure that MySQL is properly installed and the library is located in the specified path.

Update Bash Profile or Profile

Edit your "~/.bash_profile" or "~/.profile" file and add the following lines:

MYSQL=/usr/local/mysql/bin
export PATH=$PATH:$MYSQL
export DYLD_LIBRARY_PATH=/usr/local/mysql/lib:$DYLD_LIBRARY_PATH

This will add the MySQL bin directory to the PATH environment variable and the MySQL library path to the DYLD_LIBRARY_PATH environment variable, ensuring that Rails can find the missing library.

Fallback Option

If the previous step doesn't work, try creating a symbolic link:

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

This creates a symbolic link from the original library location to the path expected by Rails.

Additional Notes

• The above solutions should work on macOS Lion.
• Other approaches, such as using "install_name_tool," may not be effective on macOS Lion.
• Ensure that the library path specified in "DYLD_LIBRARY_PATH" corresponds to the correct version of MySQL installed on your system.

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