I am receiving the following error. Unlike others who seem to have been experiencing a similar situation, I have the latest XCode version.

I've followed the instructions in the book to the character. What could be going on here?

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Bulk updating Gem source index for: http://gems.rubyforge.org
Building native extensions. This could take a while...
ERROR: Error installing sqlite3-ruby:
ERROR: Failed to build gem native extension.

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb install sqlite3-ruby
checking for fdatasync() in -lrt... no
checking for sqlite3.h... yes
checking for sqlite3_open() in -lsqlite3... no

make
make: *** No rule to make target `ruby.h', needed by `sqlite3_api_wrap.o'. Stop.


Gem files will remain installed in /Library/Ruby/Gems/1.8/gems/sqlite3-ruby-1.2.4 for inspection.
Results logged to /Library/Ruby/Gems/1.8/gems/sqlite3-ruby-1.2.4/ext/sqlite3_api/gem_make.out
[mycomputersname]:sqlite-3.6.4 [myname]$

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Suggestions?