step1、install Xcode

step2、install xcpkg

step3、update xcpkg-formula-repository

xcpkg update

step4、build and install double-conversion

xcpkg install double-conversion

xcpkg formula view double-conversion

{{ formula }}

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

xcpkg formula edit double-conversion

after editing, you may want to rebuild this package ⤵︎

xcpkg install double-conversion