Question

I’m brand new to ruby. I’ve written a little script, and at the top I have the following:

require 'rubygems'
require 'net/http'
require 'json'
require 'curb'

But when I attempt to run the script, I get the following:

C:/Ruby193/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot loa
d such file -- curb (LoadError)
        from C:/Ruby193/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require
'
        from rImDrop.rb:4:in `<main>'

Everything I’ve found thus far has indicated that require 'rubygems' would fix this issue, but apparently not in my case. Would the next guess be that I have Gems installed incorrectly?

Edit: I should point out that I’m on Windows 7…

When I run gem install curb I get:

Temporarily enhancing PATH to include DevKit...
Building native extensions.  This could take a while...
ERROR:  Error installing curb:
        ERROR: Failed to build gem native extension.

        C:/Ruby193/bin/ruby.exe extconf.rb
checking for curl-config... no
checking for main() in -lcurl... no
*** 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=C:/Ruby193/bin/ruby
        --with-curl-dir
        --without-curl-dir
        --with-curl-include
        --without-curl-include=${curl-dir}/include
        --with-curl-lib
        --without-curl-lib=${curl-dir}/lib
        --with-curllib
        --without-curllib
extconf.rb:23:in `<main>':   Can't find libcurl or curl/curl.h (RuntimeError)

  Try passing --with-curl-dir or --with-curl-lib and --with-curl-include
  options to extconf.


Gem files will remain installed in C:/Ruby193/lib/ruby/gems/1.9.1/gems/curb-0.8.
0 for inspection.
Results logged to C:/Ruby193/lib/ruby/gems/1.9.1/gems/curb-0.8.0/ext/gem_make.ou
t

Answer 1

Have you installed the gem via “gem install curb” in the shell? The first two, Net::HTTP and JSON, are part of the Ruby 1.9 standard library, so they don’t actually use RubyGems at all.