step1、install Xcode

step2、install xcpkg

step3、update xcpkg-formula-repository

xcpkg update

step4、build and install flex

xcpkg install flex

xcpkg formula view flex

{{ formula }}

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

xcpkg formula edit flex

after editing, you may want to rebuild this package ⤵︎

xcpkg install flex