readlineが7にバージョンアップされてgradleとpsqlが動かなくなった

何もした覚えがないのだが、ある日急にgradleとpsqlが動かなくなった。

$ gradle tasks
dyld: Library not loaded: /usr/local/opt/readline/lib/libreadline.6.dylib
  Referenced from: /usr/local/bin/bash
  Reason: image not found
[1]    52259 abort      gradle tasks

$ psql
dyld: Library not loaded: /usr/local/opt/readline/lib/libreadline.6.dylib
  Referenced from: /usr/local/bin/psql
  Reason: image not found
[1]    52489 abort      psql

どちらもlibreadline.6.dylib がないと言ってエラーを吐いている。

あまり記憶にないけど、Homebrewでreadlineを入れていたようで、現在は7.0.3が適用されているようだ。

$ brew info readline 
readline: stable 7.0.3 (bottled) [keg-only]
Library for command-line editing
https://tiswww.case.edu/php/chet/readline/rltop.html
/usr/local/Cellar/readline/6.3.6 (46 files, 2MB)
  Poured from bottle on 2014-05-29 at 11:25:42
/usr/local/Cellar/readline/6.3.8 (46 files, 2MB)
  Poured from bottle on 2014-10-18 at 05:30:37
/usr/local/Cellar/readline/7.0.3 (46 files, 2MB)
  Poured from bottle on 2017-02-28 at 22:25:05
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/readline.rb
==> Caveats
This formula is keg-only, which means it was not symlinked into /usr/local.

macOS provides the BSD libedit library, which shadows libreadline.
In order to prevent conflicts when programs look for libreadline we are
defaulting this GNU Readline installation to keg-only.


For compilers to find this software you may need to set:
    LDFLAGS:  -L/usr/local/opt/readline/lib
    CPPFLAGS: -I/usr/local/opt/readline/include

6系のものに切り替えてみる

$ brew switch readline 6.3.8
Cleaning /usr/local/Cellar/readline/6.3.6
Cleaning /usr/local/Cellar/readline/6.3.8
Cleaning /usr/local/Cellar/readline/7.0.3
Opt link created for /usr/local/Cellar/readline/6.3.8

動いた！

$ psql --version
psql (PostgreSQL) 9.4.0

おそらく7系をインストールした何かが動かなくなるんだろうなと思いつつ、とりあえず良しとする。