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Can't install json with gem

user1937
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user1937 Published in April 27, 2018, 8:32 am

I have tried following command in terminal (OSX 10.6.6) and end up with an error. Does anyone know how to solve this?

sudo gem install json 

Building native extensions.  This could take a while...
ERROR:  Error installing json:
    ERROR: Failed to build gem native extension.

        /usr/local/bin/ruby extconf.rb
checking for ruby/re.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/local/bin/ruby
/usr/local/lib/ruby/1.9.1/mkmf.rb:368:in `try_do': The complier failed to generate an executable file. (RuntimeError)
You have to install development tools first.
    from /usr/local/lib/ruby/1.9.1/mkmf.rb:452:in `try_cpp'
    from /usr/local/lib/ruby/1.9.1/mkmf.rb:834:in `block in have_header'
    from /usr/local/lib/ruby/1.9.1/mkmf.rb:693:in `block in checking_for'
    from /usr/local/lib/ruby/1.9.1/mkmf.rb:280:in `block (2 levels) in postpone'
    from /usr/local/lib/ruby/1.9.1/mkmf.rb:254:in `open'
    from /usr/local/lib/ruby/1.9.1/mkmf.rb:280:in `block in postpone'
    from /usr/local/lib/ruby/1.9.1/mkmf.rb:254:in `open'
    from /usr/local/lib/ruby/1.9.1/mkmf.rb:276:in `postpone'
    from /usr/local/lib/ruby/1.9.1/mkmf.rb:692:in `checking_for'
    from /usr/local/lib/ruby/1.9.1/mkmf.rb:833:in `have_header'
    from extconf.rb:17:in `'


Gem files will remain installed in /usr/local/lib/ruby/gems/1.9.1/gems/json-1.5.1 for inspection.
Results logged to /usr/local/lib/ruby/gems/1.9.1/gems/json-1.5.1/ext/json/ext/generator/gem_make.out
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