/usr/bin/ruby extconf.rb
checking for 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/bin/ruby
/usr/share/ruby/mkmf.rb:381:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
        from /usr/share/ruby/mkmf.rb:506:in `try_cpp'
        from /usr/share/ruby/mkmf.rb:931:in `block in have_header'
        from /usr/share/ruby/mkmf.rb:790:in `block in checking_for'
        from /usr/share/ruby/mkmf.rb:284:in `block (2 levels) in postpone'
        from /usr/share/ruby/mkmf.rb:254:in `open'
        from /usr/share/ruby/mkmf.rb:284:in `block in postpone'
        from /usr/share/ruby/mkmf.rb:254:in `open'
        from /usr/share/ruby/mkmf.rb:280:in `postpone'
        from /usr/share/ruby/mkmf.rb:789:in `checking_for'
        from /usr/share/ruby/mkmf.rb:930:in `have_header'
        from extconf.rb:14:in `<main>'