问题
For building one particular library I need openssl library version 1.0.2m with devel package. I am working on macOS. Using brew install openssl installs latest version 1.1.1d.
回答1:
Since OpenSSL 1.0.2 is end of lifed by the end of 2019, it is no longer available via Homebrew. This is mentioned in the Homebrew 2.2.0 announcement.
It is fairly straightforward to build and install OpenSSL 1.0.2 yourself from source. You can download your required version from the Old 1.0.2 Releases page and follow the instructions found in INSTALL.
It may be possible as well to recover an older formula and install from that, but I can not guarantee how well that works. The following steps did complete the installation process:
$ git clone https://github.com/Homebrew/homebrew-core.git
$ cd homebrew-core
$ git checkout 75b57384 Formula/openssl.rb
$ brew install Formula/openssl.rb
For me, this showed:
Warning: openssl 1.1.1d is available and more recent than version 1.0.2m.
==> Downloading https://homebrew.bintray.com/bottles/openssl-1.0.2m.high_sierra.bottle.tar.gz
and went on happily after that. A quick try at the end gives some confidence that it worked out well:
$ /usr/local/opt/openssl/bin/openssl version
OpenSSL 1.0.2m 2 Nov 2017
If you prefer not to use git directly, you can also try downloading that version of openssl.rb from gitHub.com and run brew install on it.
If you wonder where that commit hash came from, I happened to know that the formula used to be called -- surprise -- openssl.rb (but using git to query for removed files would have worked as well). Therefore, I inspected the history for Formula/openssl.rb and found:
$ git log -- Formula/openssl.rb
...
commit 75b573845a17aaf3f7c84dc58e97cf5fe39a502b
Author: BrewTestBot <brew-test-bot@googlegroups.com>
Date: Thu Nov 2 17:20:33 2017 +0000
openssl: update 1.0.2m bottle.
回答2:
Instead of downloading the specific version of Formula/openssl.rb you can just use the raw reference to the file with the specific commit SHA as mentioned here.
So for the last update to version 1.0.2t the SHA is 8b9d6d688f483a0f33fcfc93d433de501b9c3513
commit 8b9d6d688f483a0f33fcfc93d433de501b9c3513
Author: BrewTestBot <homebrew-test-bot@lists.sfconservancy.org>
Date: Sat Sep 28 19:38:49 2019 +0000
openssl: update 1.0.2t bottle.
So I would execute the following command to install 1.0.2t.
brew install https://raw.githubusercontent.com/Homebrew/homebrew-core/8b9d6d688f483a0f33fcfc93d433de501b9c3513/Formula/openssl.rb
来源：https://stackoverflow.com/questions/59337838/openssl-1-0-2m-on-macos