xorg-libice fails to configure on Big Sur when installing xemacs

[wealthychef1]

I don't know anything about libICE, so I'm reporting this under xemacs. I hope that's OK. I did this: port install xemacs and got this:

Warning: The macOS 11.0 SDK does not appear to be installed. Ports may not build correctly.
Warning: You can install it as part of the Xcode Command Line Tools package by running `xcode-select --install'.
--->  Fetching archive for xorg-libice
--->  Attempting to fetch xorg-libice-1.0.10_0.darwin_20.x86_64.tbz2 from http://jog.id.packages.macports.org/macports/packages/xorg-libice
--->  Attempting to fetch xorg-libice-1.0.10_0.darwin_20.x86_64.tbz2 from https://kmq.jp.packages.macports.org/xorg-libice
--->  Attempting to fetch xorg-libice-1.0.10_0.darwin_20.x86_64.tbz2 from https://lil.fr.packages.macports.org/xorg-libice
--->  Fetching distfiles for xorg-libice
--->  Attempting to fetch libICE-1.0.10.tar.bz2 from http://ftp.nara.wide.ad.jp/pub/X11/x.org/individual/lib/
--->  Verifying checksums for xorg-libice                                            
--->  Extracting xorg-libice
--->  Configuring xorg-libice
Error: Failed to configure xorg-libice, consult /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_x11_xorg-libice/xorg-libice/work/libICE-1.0.10/config.log
Error: Failed to configure xorg-libice: configure failure: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_x11_xorg-libice/xorg-libice/main.log for details.

The ultimate problem seems to be the lack of an OSX SDK version 11. I have installed XCode and activated the command line tools and already run xcode-select --install.

root@Richs-iMac (~ ): xcode-select --install
xcode-select: error: command line tools are already installed, use "Software Update" to install updates

Im attaching the configure log from libice as it is clear what the problem is.

[wealthychef1]

libICE config log from /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_x11_xorg-libice/xorg-libice/work/libICE-1.0.10/

[wealthychef1]

the main build log from libICE

[jmroot (Joshua Root)]

You need Xcode 12.2 and the corresponding command line tools to build anything on Big Sur. If you have Xcode installed, then apparently xcodebuild -version can't find it:

:debug:sysinfo Xcode none

If you don't have a macOS 11.0 SDK in your command line tools, then they are outdated. Due to a bug, the CLTs may not be updated by Software Update when they should be: ProblemHotlist#reinstall-clt

[wealthychef1]

YES thank you. Amazing sleuthing job there! Running the command in your linked thread solved the problem. What a joy. :-)

root@Richs-iMac (~ ): sudo touch /tmp/.com.apple.dt.CommandLineTools.installondemand.in-progress
root@Richs-iMac (~ ): softwareupdate -l
Software Update Tool

Finding available software
Software Update found the following new or updated software:
* Label: Command Line Tools for Xcode-12.2
	Title: Command Line Tools for Xcode, Version: 12.2, Size: 440907K, Recommended: YES, 
* Label: Command Line Tools for Xcode-12.2
	Title: Command Line Tools for Xcode, Version: 12.2, Size: 440907K, Recommended: YES, 

and a few minutes later...

-->  Configuring xorg-libice
--->  Building xorg-libice
--->  Staging xorg-libice into destroot
--->  Installing xorg-libice @1.0.10_0
--->  Activating xorg-libice @1.0.10_0
--->  Cleaning xorg-libice
--->  Fetching archive for xorg-libsm

Hurray!