As discussed on http://cfcl.com/twiki/bin/view/Projects/SketchUp/LibraryUse, I
added some RVM directories to SketchUp Ruby's $: array:

base = ENV['HOME'] + '/.rvm/rubies/ruby-1.8.5-p231/lib/ruby/'
list = %w[ site_ruby/1.8 site_ruby/1.8/i686-darwin10.4.0 site_ruby
           1.8 1.8/i686-darwin10.4.0 ]
$:.concat( list.map{|i| base + i } ) 


I then tried a simple test:

> require 'yaml'
Error: #<LoadError: /Users/rdm/.rvm/rubies/ruby-1.8.5-p231/lib/ruby/1.8/i686-darwin10.4.0/stringio.bundle: Failed to load /Users/rdm/.rvm/rubies/ruby-1.8.5-p231/lib/ruby/1.8/i686-darwin10.4.0/stringio.bundle>
(eval):1
/Users/rdm/.rvm/rubies/ruby-1.8.5-p231/lib/ruby/1.8/yaml.rb:9
(eval):1:in `require'
(eval):1


Dan Rathbun (on SketchUcation) asked whether the requested bundle exists:

$ ls -l /Users/rdm/.rvm/rubies/ruby-1.8.5-p231/lib/ruby/1.8/i686-darwin10.4.0/stringio.bundle
-rwxr-xr-x  1 rdm  staff  30256 Jul 13 01:49 /Users/rdm/.rvm/rubies/ruby-1.8.5-p231/lib/ruby/1.8/i686-darwin10.4.0/stringio.bundle


He also asked what dylibs are present in the app:

$ pwd
/Applications/Google SketchUp 7

$  du -a . | sort -k 2 | grep dylib
784	./LayOut.app/Contents/Frameworks/libAlchemyExt.dylib
1856	./LayOut.app/Contents/Frameworks/libIGAttrs.dylib
3784	./LayOut.app/Contents/Frameworks/libIGCore.dylib
12384	./LayOut.app/Contents/Frameworks/libIGGfx.dylib
1232	./LayOut.app/Contents/Frameworks/libIGMath.dylib
4440	./LayOut.app/Contents/Frameworks/libIGSg.dylib
736	./LayOut.app/Contents/Frameworks/libIGUtils.dylib
160	./LayOut.app/Contents/Frameworks/libgif.4.dylib
544	./LayOut.app/Contents/Frameworks/libjpeg.62.dylib
1472	./LayOut.app/Contents/Frameworks/libpaintlib.1.dylib
608	./LayOut.app/Contents/Frameworks/libpng12.0.dylib
1456	./LayOut.app/Contents/Frameworks/libtiff.3.dylib
160	./SketchUp.app/Contents/Frameworks/SAPI.framework/Versions/A/libgif.4.dylib
544	./SketchUp.app/Contents/Frameworks/SAPI.framework/Versions/A/libjpeg.62.dylib
1472	./SketchUp.app/Contents/Frameworks/SAPI.framework/Versions/A/libpaintlib.1.dylib
608	./SketchUp.app/Contents/Frameworks/SAPI.framework/Versions/A/libpng12.0.dylib
1456	./SketchUp.app/Contents/Frameworks/SAPI.framework/Versions/A/libtiff.3.dylib
784	./SketchUp.app/Contents/Frameworks/libAlchemyExt.dylib
1688	./SketchUp.app/Contents/Frameworks/libCommonGeoutils.dylib
320	./SketchUp.app/Contents/Frameworks/libCommonImage.dylib
248	./SketchUp.app/Contents/Frameworks/libCommonInternet.dylib
792	./SketchUp.app/Contents/Frameworks/libCommonUtils.dylib
264	./SketchUp.app/Contents/Frameworks/libCommonWarehouseapi.dylib
936	./SketchUp.app/Contents/Frameworks/libCommonXML.dylib
968	./SketchUp.app/Contents/Frameworks/libGeometry.dylib
1856	./SketchUp.app/Contents/Frameworks/libIGAttrs.dylib
3784	./SketchUp.app/Contents/Frameworks/libIGCore.dylib
12384	./SketchUp.app/Contents/Frameworks/libIGGfx.dylib
1232	./SketchUp.app/Contents/Frameworks/libIGMath.dylib
4440	./SketchUp.app/Contents/Frameworks/libIGSg.dylib
736	./SketchUp.app/Contents/Frameworks/libIGUtils.dylib
12936	./SketchUp.app/Contents/Frameworks/libModel.dylib
1072	./SketchUp.app/Contents/Frameworks/libgdal.dylib
160	./SketchUp.app/Contents/Frameworks/libgif.4.dylib
544	./SketchUp.app/Contents/Frameworks/libjpeg.62.dylib
1472	./SketchUp.app/Contents/Frameworks/libpaintlib.1.dylib
608	./SketchUp.app/Contents/Frameworks/libpng12.0.dylib
976	./SketchUp.app/Contents/Frameworks/libproj.dylib
1456	./SketchUp.app/Contents/Frameworks/libtiff.3.dylib
784	./Style_Builder.app/Contents/Frameworks/libAlchemyExt.dylib
1856	./Style_Builder.app/Contents/Frameworks/libIGAttrs.dylib
3784	./Style_Builder.app/Contents/Frameworks/libIGCore.dylib
12384	./Style_Builder.app/Contents/Frameworks/libIGGfx.dylib
1232	./Style_Builder.app/Contents/Frameworks/libIGMath.dylib
4440	./Style_Builder.app/Contents/Frameworks/libIGSg.dylib
736	./Style_Builder.app/Contents/Frameworks/libIGUtils.dylib
160	./Style_Builder.app/Contents/Frameworks/libgif.4.dylib
544	./Style_Builder.app/Contents/Frameworks/libjpeg.62.dylib
1472	./Style_Builder.app/Contents/Frameworks/libpaintlib.1.dylib
608	./Style_Builder.app/Contents/Frameworks/libpng12.0.dylib
1456	./Style_Builder.app/Contents/Frameworks/libtiff.3.dylib

