dyld: Library not loaded: /usr/local/opt/openssl/lib/libssl.1.0.0.dylib

Question

I installed vapor via homebrew and then immediately wanted to jump into a project by executing vapor new Hello but then got the following message back in the terminal:

dyld: Library not loaded: /usr/local/opt/openssl/lib/libssl.1.0.0.dylib
Referenced from: /usr/local/bin/vapor
Reason: image not found
zsh: abort      vapor new Hello

I tried some approaches to fix this like uninstalling and reinstalling openssl via brew but that didn't work . Also tried something I found in the internet but nothing worked. I assume it has something to do with vapor only working with version 1.0.0 but not 1.1.1 and that's what I have. I guess I need to downgrade to 1.0.0 but how'd I do that? I'm on MacOS Catalina if that matters.

Answer 1

Update: As of December 2020 and beyond, brew switch does not work, so use the other answer by @angabriel:

brew install rbenv/tap/[email protected]
ln -sfn /usr/local/Cellar/[email protected]/1.0.2t /usr/local/opt/openssl

Original Answer: Switch to an older openssl package

brew switch openssl 1.0.2s

Or, depending on your exact system configuration, you may need to switch to a different version. Check the output of ls -al /usr/local/Cellar/openssl for the version number to switch to.

brew switch openssl 1.0.2q
# or
brew switch openssl 1.0.2r
# or 
brew switch openssl 1.0.2s
# or
brew switch openssl 1.0.2t
# etc...

Answer 2

December 2020 This thread has many answers, but none worked for me.
The top answer also suggests a downgrade:

brew switch ... throws Calling brew switch is disabled!

this worked for me:

brew install rbenv/tap/[email protected]
ln -sfn /usr/local/Cellar/[email protected]/1.0.2t /usr/local/opt/openssl

found here: https://github.com/kelaberetiv/TagUI/issues/86
(I need to run old mongodb 3.4 on OSX 10.13.x)

Answer 3

brew switch openssl 1.0.2s

worked for me on "macOS Mojave", "version 10.14.6".