ruby - I am unable to install selenium webdriver on mac -


ennas-macbook-pro:all_tests jholland$ sudo gem install selenium-webdriver building native extensions. take while... error: error installing selenium-webdriver: error: failed build gem native extension.

    /users/jholland/.rvm/rubies/ruby-2.0.0-p451/bin/ruby extconf.rb checking ffi.h... *** extconf.rb failed *** not create makefile due reason, lack of necessary libraries and/or headers.  check mkmf.log file more details.  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=/users/jholland/.rvm/rubies/ruby-2.0.0-p451/bin/ruby     --with-ffi_c-dir     --without-ffi_c-dir     --with-ffi_c-include     --without-ffi_c-include=${ffi_c-dir}/include     --with-ffi_c-lib     --without-ffi_c-lib=${ffi_c-dir}/     --with-libffi-config     --without-libffi-config     --with-pkg-config     --without-pkg-config /users/jholland/.rvm/rubies/ruby-2.0.0-p451/lib/ruby/2.0.0/mkmf.rb:434:in `try_do': compiler failed generate executable file. (runtimeerror) have install development tools first.     /users/jholland/.rvm/rubies/ruby-2.0.0-p451/lib/ruby/2.0.0/mkmf.rb:565:in `try_cpp'     /users/jholland/.rvm/rubies/ruby-2.0.0-p451/lib/ruby/2.0.0/mkmf.rb:1044:in `block in have_header'     /users/jholland/.rvm/rubies/ruby-2.0.0-p451/lib/ruby/2.0.0/mkmf.rb:895:in `block in checking_for'     /users/jholland/.rvm/rubies/ruby-2.0.0-p451/lib/ruby/2.0.0/mkmf.rb:340:in `block (2 levels) in postpone'     /users/jholland/.rvm/rubies/ruby-2.0.0-p451/lib/ruby/2.0.0/mkmf.rb:310:in `open'     /users/jholland/.rvm/rubies/ruby-2.0.0-p451/lib/ruby/2.0.0/mkmf.rb:340:in `block in postpone'     /users/jholland/.rvm/rubies/ruby-2.0.0-p451/lib/ruby/2.0.0/mkmf.rb:310:in `open'     /users/jholland/.rvm/rubies/ruby-2.0.0-p451/lib/ruby/2.0.0/mkmf.rb:336:in `postpone'     /users/jholland/.rvm/rubies/ruby-2.0.0-p451/lib/ruby/2.0.0/mkmf.rb:894:in `checking_for'     /users/jholland/.rvm/rubies/ruby-2.0.0-p451/lib/ruby/2.0.0/mkmf.rb:1043:in `have_header'     extconf.rb:16:in `<main>'  extconf failed, exit code 1

gem files remain installed in /users/jholland/.rvm/rubies/ruby-2.0.0-p451/lib/ruby/gems/2.0.0/gems/ffi-1.9.3 inspection. results logged /users/jholland/.rvm/rubies/ruby-2.0.0-p451/lib/ruby/gems/2.0.0/extensions/x86_64-darwin-12/2.0.0-static/ffi-1.9.3/gem_make.out

i using mac mavericks 10.9.1 , have updated ruby 2.0.0 p451 v. stuck right


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