Trying to install on my Mac with OSX 10.9.4, Ruby 1.9.3p448:

gem install ruby_kml
Building native extensions. This could take a while...
Building nokogiri using packaged libraries.
ERROR: Error installing ruby_kml:
ERROR: Failed to build gem native extension.

/Users/ltalley/.rvm/rubies/ruby-1.9.3-p448/bin/ruby extconf.rb

Building nokogiri using packaged libraries.
checking for iconv.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
--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/ltalley/.rvm/rubies/ruby-1.9.3-p448/bin/ruby
--help
--clean
--use-system-libraries
--enable-static
--disable-static
--with-zlib-dir
--without-zlib-dir
--with-zlib-include
--without-zlib-include=${zlib-dir}/include
--with-zlib-lib
--without-zlib-lib=${zlib-dir}/lib
--enable-cross-build
--disable-cross-build
/Users/ltalley/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/mkmf.rb:381:in try_do': The compiler failed to generate an executable file. (RuntimeError) You have to install development tools first. from /Users/ltalley/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/mkmf.rb:506:intry_cpp'
from /Users/ltalley/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/mkmf.rb:931:in block in have_header' from /Users/ltalley/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/mkmf.rb:790:inblock in checking_for'
from /Users/ltalley/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/mkmf.rb:284:in block (2 levels) in postpone' from /Users/ltalley/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/mkmf.rb:254:inopen'
from /Users/ltalley/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/mkmf.rb:284:in block in postpone' from /Users/ltalley/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/mkmf.rb:254:inopen'
from /Users/ltalley/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/mkmf.rb:280:in postpone' from /Users/ltalley/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/mkmf.rb:789:inchecking_for'
from /Users/ltalley/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/mkmf.rb:930:in have_header' from extconf.rb:103:inhave_iconv?'

I have no idea how this works. Where do i have to put my Code and how to I call the Function? What happens then? Creates this Code a real KML File?

Can somebody help me?

Affect by ruby-lang regression bug. 2537

Super called outside of method

http://redmine.ruby-lang.org/issues/show/2537

When I am using look at in placemark in the following code,

require 'rubygems'
require 'ruby_kml'

kml = KMLFile.new
folder = KML::Folder.new(:name => 'Melbourne Stations')

[
  ["Flinders St",    -37.818078, 144.966811, 0.00],
  ["Southern Cross", -37.818358, 144.952417, 0.00],
].each do |name, lat, lng, alt|
  folder.features << KML::Placemark.new(
    :name => name,
    :geometry => KML::Point.new(:coordinates => {:lat => lat, :lng => lng, :alt => alt}, :altitude_mode => 'absolute'),
    :look_at => KML::LookAt.new({longitude: 144.966811, latitude: -37.818078, altitude: 0.00, range: 10, tilt: 10, heading: 5, altitude_mode: "absolute"})
  )
end

kml.objects << folder
puts kml.render

I am getting the following error,

NameError: uninitialized constant KML::LookAt
  const_missing at org/jruby/RubyModule.java:2723
         (root) at kml.rb:13
           each at org/jruby/RubyArray.java:1613
         (root) at kml.rb:9

I am using jruby-1.7.13

I might be doing it the wrong way, please guide.

1. Error:
   test_cdata_description(KMLFileTest):
   Errno::ENOENT: No such file or directory - test/cdata_and_snippet.kml
   /Users/jeffwilliams/dev/ruby_kml/test/kml_file_test.rb:36:in read' /Users/jeffwilliams/dev/ruby_kml/test/kml_file_test.rb:36:intest_cdata_description'

2. Error:
   test_geometry_styles(KMLFileTest):
   Errno::ENOENT: No such file or directory - test/polygon_style.kml
   /Users/jeffwilliams/dev/ruby_kml/test/kml_file_test.rb:171:in read' /Users/jeffwilliams/dev/ruby_kml/test/kml_file_test.rb:171:intest_geometry_styles'

3. Error:
   test_ground_overlays(KMLFileTest):
   Errno::ENOENT: No such file or directory - test/ground_overlays.kml
   /Users/jeffwilliams/dev/ruby_kml/test/kml_file_test.rb:58:in read' /Users/jeffwilliams/dev/ruby_kml/test/kml_file_test.rb:58:intest_ground_overlays'

4. Error:
   test_paths(KMLFileTest):
   Errno::ENOENT: No such file or directory - test/paths.kml
   /Users/jeffwilliams/dev/ruby_kml/test/kml_file_test.rb:99:in read' /Users/jeffwilliams/dev/ruby_kml/test/kml_file_test.rb:99:intest_paths'

5. Error:
   test_placemark(KMLFileTest):
   Errno::ENOENT: No such file or directory - test/simple_placemark.kml
   /Users/jeffwilliams/dev/ruby_kml/test/kml_file_test.rb:13:in read' /Users/jeffwilliams/dev/ruby_kml/test/kml_file_test.rb:13:intest_placemark'

6. Error:
   test_polygon(KMLFileTest):
   Errno::ENOENT: No such file or directory - test/polygon.kml
   /Users/jeffwilliams/dev/ruby_kml/test/kml_file_test.rb:127:in read' /Users/jeffwilliams/dev/ruby_kml/test/kml_file_test.rb:127:intest_polygon'

7. Error:
   test_style_map(KMLFileTest):
   Errno::ENOENT: No such file or directory - test/style_map.kml
   /Users/jeffwilliams/dev/ruby_kml/test/kml_file_test.rb:214:in read' /Users/jeffwilliams/dev/ruby_kml/test/kml_file_test.rb:214:intest_style_map'

ruby_kml can not create kml-files with styles containing a LableStyle.
LableStyle can go parallel to IconStyle according to KML docu

Your gem doesn't depend on 'builder', which ruby_kml does!
Thought you'd like to know, thanks for the work

The documentation on KML allows and ID-attribute: e.g.<Placemark id="ID">. The comments in e.g. the placemark.rb object file, hint at this too. It is, however, not possible to set the ID, since it gets ignored.

A quick hack is a change to Placemark#render:

    def render(xm=Builder::XmlMarkup.new(:indent => 2))
      xm.Placemark(id: self.id) {
        super
        ...
      }
    end

I've some ideas on how to refactor a little to allow the ID to be set more generic, but that is quite some work, and this project seems a bit stale. Is this a feature that would be wanted?