How to install Nokogiri as a Macruby gem?

Question

The latest MacRuby release notes (v0.6) state that the authors have managed to get this release working with the SQLite and Nokogiri gems. However when I run sudo macgem install nokogiri I get the following errors:

ERROR:  Error installing nokogiri:

extconf failed:

and then a bunch of paths followed by:

libxml2 is missing.  try 'port install libxml2' or 'yum install libxml2'
/Library/Frameworks/MacRuby.framework/Versions/0.6/usr/lib/ruby/Gems/1.9.0/gems/nokogiri-1.4.1/ext/nokogiri/extconf.rb:1:in `<main>': libxml2 is missing.  try 'port install libxml2' or 'yum install libxml2' (SystemExit)

Anyone knows how to get this working? My platform is Mac OS X 10.6.3. Nokogiri normally (meaining on plain old ruby 1.8.7) installs without a problem.

Progress

OK, so I have:

1. git clone http://github.com/tenderlove/nokogiri.git
2. cd nokogiri/ext/nokogiri
3. Then I've rebuilt the macports libraries with sudo port upgrade --enforce-variants libxml2 +universal and sudo port upgrade --enforce-variants libxslt +universal
4. Then I've executed macruby extconf.rb successfully
5. Then I proceed to make

At this point it errors out like so:

/usr/bin/gcc -I. -I/opt/local/include/libxml2 -I/opt/local/include/ -I/Library/Frameworks/MacRuby.framework/Versions/0.6/usr/include/ruby-1.9.0/universal-darwin10.0 -I/Library/Frameworks/MacRuby.framework/Versions/0.6/usr/include/ruby-1.9.0/ruby/backward -I/Library/Frameworks/MacRuby.framework/Versions/0.6/usr/include/ruby-1.9.0 -I. -DHAVE_XMLRELAXNGSETPARSERSTRUCTUREDERRORS -DHAVE_XMLRELAXNGSETPARSERSTRUCTUREDERRORS -DHAVE_XMLRELAXNGSETVALIDSTRUCTUREDERRORS -DHAVE_XMLSCHEMASETVALIDSTRUCTUREDERRORS -DHAVE_XMLSCHEMASETPARSERSTRUCTUREDERRORS -I/opt/local/include/ -I/opt/local/include/libxml2 -I/opt/local/include  -fno-common -fexceptions -fno-common -pipe -O3 -g -Wall -Wno-parentheses  -g -DXP_UNIX -O3 -Wall -Wcast-qual -Wwrite-strings -Wconversion -Wmissing-noreturn -Winline -arch i386 -arch x86_64 -o html_document.o -c html_document.c
In file included from ./html_document.h:4,
             from html_document.c:1:
./nokogiri.h:35:16: error: st.h: No such file or directory
In file included from ./html_document.h:4,
             from html_document.c:1:
./nokogiri.h:35:16: error: st.h: No such file or directory
lipo: can't open input file: /var/folders/wU/wUGgoG1JGeKBgwalWLPMAU+++TI/-Tmp-//ccSgAUv5.out (No such file or directory)
make: *** [html_document.o] Error 1

Answer 1

I think you have to build from source since only Nokogiri's head is MacRuby compliant