<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class="">Sorry, if this question has already been answered.</div><div class=""><br class=""></div><div class="">I updated my system to Big Sur and followed the MacPorts migration instructions and updated Xcode to version 12.3.</div><div class=""><br class=""></div><div class="">However, when I try to build ports in MacPorts, I now get the following warnings.</div><div class=""><br class=""></div><blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;" class=""><div class="">Warning: The macOS 11.1 SDK does not appear to be installed. Ports may not build correctly.</div><div class="">Warning: You can install it as part of the Xcode Command Line Tools package by running `xcode-select --install’.</div></blockquote><div class=""><br class=""></div><div class="">What am I doing wrong?</div></body></html>