Return to readline version 6.x in Homebrew to fix Postgresql?
I'm no Homebrew expert but I think it has "upgraded" me from readline version 6.x to 7.0 sometime after 9/15/16:
eat@eric-macbook:Homebrew$ brew info readline
readline: stable 7.0 (bottled) [keg-only]
Library for command-line editing
https://tiswww.case.edu/php/chet/readline/rltop.html
/usr/local/Cellar/readline/7.0 (45 files, 2M)
This has caused headaches for my 9.4.5 Homebrew version of Postgresql (I need the older 9.4 for comparability reasons):
eat@eric-macbook:~$ psql --version
dyld: Library not loaded: /usr/local/opt/readline/lib/libreadline.6.dylib
Referenced from: /usr/local/Cellar/postgresql/9.4.5/bin/psql
Reason: image not found
Trace/BPT trap: 5
Unfortunately I can't find a 6.x version of readline on Homebrew to revert to - only 7.0 seems to be available(?).
My question is twofold:
- Is the the readline version mismatch the cause of my postgres/psql problem?
- If so, how do I return to 6.x with Homebrew to correct the problem?
Thank you in advance!
Answer
To answer the specific question.
You can switch between version of installed brew packages which are still around locally as explained in this question: Homebrew install specific version of formula?
To downgrade to readline 6.x the following command worked for me:
brew switch readline 6.3.8