Installing littler package on MacOS

When installing littler using install.packages('littler'), I got below message:

 * new binary r installed in bin/ subdirectory                                        
 * consider adding a symbolic link from, e.g., /usr/local/bin                         
 * on OS X, you may have to name this 'lr' instead 

How can I create this symbolic link?  

Thanks,
Naresh