Library not loaded: /usr/local/opt/readline/lib/libreadline.6.2.dylib

Question

I just installed posgresql with homebrew and when I go on to type the command

psql

I get the following error:

dyld: Library         


        

Answer 1

None of those solutions worked for me; I had to run :

brew upgrade bash

from : https://github.com/Homebrew/homebrew-core/issues/5799

Answer 2

I tried all these terminal commands and nothing worked so decided to fix it manually..

Open finder and hit command+shift+g

Go to this folder /usr/local/opt/readline/lib/

you should see multiple versions of these files

libreadline.6.dylib
libreadline.7.0.dylib

rename any of them to whichever library is not loaded

this is: /usr/local/opt/readline/lib/libreadline.6.2.dylib
mine was: /usr/local/opt/readline/lib/libreadline.6.dylib

Answer 3

I found this solution helpful

brew upgrade bash

https://github.com/Homebrew/homebrew-core/issues/5799

Answer 4

If the situation is you have a higher version readline say 7.0. You can do this

cd /usr/local/opt/readline/lib    
ln libreadline.7.0.dylib libreadline.6.2.dylib

Answer 5

The key problem is that your postgresql was trying to find the libreadline.6.2.dylib but your readline is version 7.0, so only 7's lib is linked.

I don't think upgrading postgresql is a good idea, it's not easy and may cause a lot of problem, especially when you already have database data.

What I do, is to switch the version of readline. When you check brew info readline, you will find different versions, mine is 6.3.8, so I switch to that version by executing:

$ brew switch readline 6.3.8

It will change to 6.3.8 and create the link:

Cleaning /usr/local/Cellar/readline/6.3.8
Cleaning /usr/local/Cellar/readline/7.0.1
Opt link created for /usr/local/Cellar/readline/6.3.8

In this case, all the linked lib becomes to 6 version, and command line works:

$ ls /usr/local/opt/readline/lib/
libhistory.6.2.dylib    libhistory.dylib    libreadline.a
libhistory.6.3.dylib    libreadline.6.2.dylib   libreadline.dylib
libhistory.6.dylib  libreadline.6.3.dylib
libhistory.a        libreadline.6.dylib

However, if you have different apps using the different version of readline, I think you should consider upgrading.

---

Update: 06/02/2019

What if the old version is not installed?

Homebrew doesn't provide a way to install old version formula. And since v2.0.0, it will run brew cleanup as default behaviours every 30 days. Therefore, you may accidentally update brew and delete the old version.

Here are the steps to install old version:

1. Go to homebrew-core directory:

    $ cd $(brew --repository)/Library/Taps/homebrew/homebrew-core

2. Check the hash for old Formula:

    $ git log master -- Formula/readline.rb

3. Find the corresponding version of the hash value

    commit 1dd4221c35716d6bec363ad3425ef93ffe7d9b9f
    Author: BrewTestBot <brew-test-bot@googlegroups.com>
    Date:   Wed Aug 15 21:51:16 2018 +0000

        readline: update 7.0.5 bottle.

4. Checkout to old formula:

    $ git checkout 1dd4221c35716d6bec363ad3425ef93ffe7d9b9f Formula/readline.rb

5. Reinstall the formula:

    $ brew reinstall readline

6. Reset the repo

Following those steps, you can reinstall the old version of formula.

Answer 6

This had helped me: uninstall all readline and postgresql

export CPPFLAGS=-I/usr/local/opt/readline/include export LDFLAGS=-L/usr/local/opt/readline/lib

and install posqtgresql