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	ERROR: Failed to build gem native extension.

    current directory: /var/lib/gems/2.7.0/gems/nio4r-2.5.8/ext/nio4r
/usr/bin/ruby2.7 -I /usr/lib/ruby/2.7.0 -r ./siteconf20230304-6677-1jq3ni4.rb extconf.rb
checking for unistd.h... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.
Provided configuration options:
	--with-opt-dir
	--without-opt-dir
	--with-opt-include
	--without-opt-include=${opt-dir}/include
	--with-opt-lib
	--without-opt-lib=${opt-dir}/lib
	--with-make-prog
	--without-make-prog
	--srcdir=.
	--curdir
	--ruby=/usr/bin/$(RUBY_BASE_NAME)2.7
	--with-unistd-dir
	--without-unistd-dir
	--with-unistd-include
	--without-unistd-include=${unistd-dir}/include
	--with-unistd-lib
	--without-unistd-lib=${unistd-dir}/lib
/usr/lib/ruby/2.7.0/mkmf.rb:471:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
	from /usr/lib/ruby/2.7.0/mkmf.rb:613:in `try_cpp'
	from /usr/lib/ruby/2.7.0/mkmf.rb:1124:in `block in have_header'
	from /usr/lib/ruby/2.7.0/mkmf.rb:971:in `block in checking_for'
	from /usr/lib/ruby/2.7.0/mkmf.rb:361:in `block (2 levels) in postpone'
	from /usr/lib/ruby/2.7.0/mkmf.rb:331:in `open'
	from /usr/lib/ruby/2.7.0/mkmf.rb:361:in `block in postpone'
	from /usr/lib/ruby/2.7.0/mkmf.rb:331:in `open'
	from /usr/lib/ruby/2.7.0/mkmf.rb:357:in `postpone'
	from /usr/lib/ruby/2.7.0/mkmf.rb:970:in `checking_for'
	from /usr/lib/ruby/2.7.0/mkmf.rb:1123:in `have_header'
	from extconf.rb:15:in `<main>'

To see why this extension failed to compile, please check the mkmf.log which can be found here:

  /var/lib/gems/2.7.0/extensions/x86_64-linux/2.7.0/nio4r-2.5.8/mkmf.log