Please help... i was tryed all ruby versions and have the same error.
!!!!THIS IS WINDOWS!!!!
gem install yajl-ruby
Temporarily enhancing PATH for MSYS/MINGW...
Building native extensions. This could take a while...
ERROR: Error installing yajl-ruby:
ERROR: Failed to build gem native extension.
current directory: C:/Ruby/lib/ruby/gems/2.4.0/gems/yajl-ruby-1.3.1/ext/yajl
C:/Ruby/bin/ruby.exe -r ./siteconf20171206-2828-1djbqt4.rb extconf.rb
creating Makefile
current directory: C:/Ruby/lib/ruby/gems/2.4.0/gems/yajl-ruby-1.3.1/ext/yajl
make "DESTDIR=" clean
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current directory: C:/Ruby/lib/ruby/gems/2.4.0/gems/yajl-ruby-1.3.1/ext/yajl
make "DESTDIR="
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make failed, exit code 1
Gem files will remain installed in C:/Ruby/lib/ruby/gems/2.4.0/gems/yajl-ruby-1.3.1 for inspection.
Results logged to C:/Ruby/lib/ruby/gems/2.4.0/extensions/x64-mingw32/2.4.0/yajl-ruby-1.3.1/gem_make.out
google does not help me also.
UPDATE: the problem was fixed by installing kali linux. the problem was the windows. thank you all. i lost my day on it.