Pin icu4c and readline to avoid broken dependency links after Brew upgrades
It's a follow-up after !708 (merged). During the discussion, it was decided to skip pinning the icu4c
version in brew
because it's necessity was not so obvious (contrary to PKG_CONFIG_PATH
customization).
But, I recently came across a case when brew upgrade yarn
has caused a broken link between charlock_holmes@0.7.6
(and a couple more gems) and icu4c@63.1
because icu4c
was upgraded to 64.2
.