step1、install Xcode

step2、install xcpkg

step3、update xcpkg-formula-repository

xcpkg update

step4、build and install icu4c

xcpkg install icu4c

xcpkg formula view icu4c

{{ formula }}

if the formula of icu4c dosn't meet your needs, you can edit it ⤵︎

xcpkg formula edit icu4c

after editing, you may want to rebuild this package ⤵︎

xcpkg install icu4c