Error installing jekyll: ERROR: Failed to build gem native extension. (macOS Big Sur 11.3)

I followed every step from the Jekyll MacOS installation page. Jekyll on macOS | Jekyll • Simple, blog-aware, static sites
But I always get this error:
Building native extensions. This could take a while…
ERROR: Error installing jekyll:
ERROR: Failed to build gem native extension.
I saw same ERROR on various websites. I followed the troubleshooting commands provided, but didn’t work. May I ask it once again and if anyone can give more suggestions? Thank you very much!

what does the terminal command ‘make --version’ give you?

machine:~ roadie$ which make
make is /usr/bin/make
machine:~ roadie$ make --version
GNU Make 3.81
Copyright (C) 2006  Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.

This program built for i386-apple-darwin11.3.0
machine:~ roadie$ 

do you have the developer tools installed? and the commandline tools?

machine:~ roadie$ xcode-select --install
xcode-select: error: command line tools are already installed, use "Software Update" to install updates
machine:~ roadie$ 

are you using rbenv or rvm for your ruby versions?