gem install rails Building native extensions. This could take a while... ERROR: Error installing rails: ERROR: Failed to build gem native extension.
current directory: /Users/leandro/.rvm/rubies/ruby-2.4.1/lib/ruby/gems/2.4.0/gems/nio4r-2.2.0/ext/nio4r /Users/leandro/.rvm/rubies/ruby-2.4.1/bin/ruby -r ./siteconf20180306-1409-1n5ahe6.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
--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=/Users/leandro/.rvm/rubies/ruby-2.4.1/bin/$(RUBY_BASE_NAME)
/Users/leandro/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/mkmf.rb:457:in try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
from /Users/leandro/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/mkmf.rb:588:intry_cpp'
from /Users/leandro/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/mkmf.rb:1095:in block in have_header'
from /Users/leandro/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/mkmf.rb:945:inblock in checking_for'
from /Users/leandro/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/mkmf.rb:351:in block (2 levels) in postpone'
from /Users/leandro/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/mkmf.rb:321:inopen'
from /Users/leandro/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/mkmf.rb:351:in block in postpone'
from /Users/leandro/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/mkmf.rb:321:inopen'
from /Users/leandro/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/mkmf.rb:347:in postpone'
from /Users/leandro/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/mkmf.rb:944:inchecking_for'
from /Users/leandro/.rvm/rubies/ruby-2.4.1/lib/ruby/2.4.0/mkmf.rb:1094:in have_header'
from extconf.rb:14:in'
To see why this extension failed to compile, please check the mkmf.log which can be found here:
/Users/leandro/.rvm/rubies/ruby-2.4.1/lib/ruby/gems/2.4.0/extensions/x86_64-darwin-17/2.4.0/nio4r-2.2.0/mkmf.log
extconf failed, exit code 1
Gem files will remain installed in /Users/leandro/.rvm/rubies/ruby-2.4.1/lib/ruby/gems/2.4.0/gems/nio4r-2.2.0 for inspection. Results logged to /Users/leandro/.rvm/rubies/ruby-2.4.1/lib/ruby/gems/2.4.0/extensions/x86_64-darwin-17/2.4.0/nio4r-2.2.0/gem_make.out
