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I see the problem with installing gem sqlite3-ruby. This way help me to fix it! You need to install developer headers for provide compilation the library from sources.

SQLite3:

Without the -d option, rails will default to sqlite. To install SQLite3:

~$ sudo apt-get install libsqlite3-0 libsqlite3-dev
~$ sudo gem install sqlite3-ruby 

http://groups.google.com/group/rubyonrails-talk/browse_thread/thread/ee90cf062d9741e2

Hi friends
I am new to get on the rails & I have allready a problem in installing
sqlite3-ruby.
I just made my first programme :Hello world.When I execute
http://localhost:3000/hello_world on my browser,then  the following error
comes with it.
[

no such file to load -- sqlite3

RAILS_ROOT: /home/whatsup3/HelloProject
Application Trace  | Framework
Trace| Full
Trace 

/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
`gem_original_require'
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'

..........
]
After that I tried:gem install sqlite3-ruby then the folloing error comes:

[
WARNING:  Installing to ~/.gem since /usr/lib/ruby/gems/1.8 and
          /usr/bin aren't both writable.
WARNING:  You don't have /home/whatsup3/.gem/ruby/1.8/bin in your PATH,
          gem executables will not run.
Building native extensions.  This could take a while...
ERROR:  Error installing sqlite3-ruby:
        ERROR: Failed to build gem native extension.

/usr/bin/ruby extconf.rb install sqlite3-ruby
checking for fdatasync() in -lrt... no
checking for sqlite3.h... no

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

Gem files will remain installed in
/home/whatsup3/.gem/ruby/1.8/gems/sqlite3-ruby-1.2.4 for inspection.
Results logged to
/home/whatsup3/.gem/ruby/1.8/gems/sqlite3-ruby-1.2.4/ext/sqlite3_api/gem_make.out
]

What should I do?
The OS is :Fedora Core 7