I can't install it by all means

[LeXwDeX]

OS version：10.15.7

ruby 2.6.3p62 (2019-04-16 revision 67580) [universal.x86_64-darwin19]

xcode-select version 2373.

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I have tried to upgrade Ruby,XCODE,Command-Line But it still reports an error

➜  ~ sudo gem install iStats
Building native extensions. This could take a while...
ERROR:  Error installing iStats:
ERROR: Failed to build gem native extension.

current directory: /Library/Ruby/Gems/2.6.0/gems/iStats-1.6.1/ext/osx_stats
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/ruby -I /Library/Ruby/Site/2.6.0 -r ./siteconf20210526-5653-192hz9m.rb extconf.rb
creating Makefile

current directory: /Library/Ruby/Gems/2.6.0/gems/iStats-1.6.1/ext/osx_stats
make DESTDIR\= clean

current directory: /Library/Ruby/Gems/2.6.0/gems/iStats-1.6.1/ext/osx_stats
make DESTDIR\=
make: *** No rule to make target `/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.1.sdk/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/include/ruby-2.6.0/universal-darwin19/ruby/config.h', needed by `smc.o'.  Stop.

make failed, exit code 2

Gem files will remain installed in /Library/Ruby/Gems/2.6.0/gems/iStats-1.6.1 for inspection.
Results logged to /Library/Ruby/Gems/2.6.0/extensions/universal-darwin-19/2.6.0/iStats-1.6.1/gem_make.out

[ChiehJang]

https://notes.zhangjie.work/index.php/archives/35/

[haassttee]

https://notes.zhangjie.work/index.php/archives/35/

I tried this it wont work:((