I'm trying to install the "sqlite3-ruby" gem (or the "sqlite3" gem) on OS X 10.6. I'm using ruby-1.9.2 and I currently get the following:
 $ sqlite3 --version
3.7.4
 $ sudo gem install sqlite3
Building native extensions.  This could take a while...
ERROR:  Error installing sqlite3-ruby:
    ERROR: Failed to build gem native extension.
/Users/folken/.rvm/rubies/ruby-1.9.2-head/bin/ruby extconf.rb
checking for sqlite3.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
    --without-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/folken/.rvm/rubies/ruby-1.9.2-head/bin/ruby
    --with-sqlite3-dir
    --without-sqlite3-dir
    --with-sqlite3-include
    --without-sqlite3-include=${sqlite3-dir}/include
    --with-sqlite3-lib
    --without-sqlite3-lib=${sqlite3-dir}/lib
/Users/folken/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:368:in `try_do': The complier failed to generate an executable file. (RuntimeError)
You have to install development tools first.
    from /Users/folken/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:452:in `try_cpp'
    from /Users/folken/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:853:in `block in find_header'
    from /Users/folken/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:693:in `block in checking_for'
    from /Users/folken/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:280:in `block (2 levels) in postpone'
    from /Users/folken/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:254:in `open'
    from /Users/folken/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:280:in `block in postpone'
    from /Users/folken/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:254:in `open'
    from /Users/folken/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:276:in `postpone'
    from /Users/folken/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:692:in `checking_for'
    from /Users/folken/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:852:in `find_header'
    from extconf.rb:28:in `<main>'
Gem files will remain installed in /Users/folken/.rvm/gems/ruby-1.9.2-head/gems/sqlite3-1.3.3 for inspection.
The following is the results of which & whereis, and the sqlite3.h is located in /opt/local/include:
 $ which sqlite3
/opt/local/bin/sqlite3
 $ whereis sqlite3
/usr/bin/sqlite3
I've tried passing in the following as well:
sudo gem install sqlite3 -- --with-sqlite3-include /opt/local/include --with-sqlite3-lib /opt/local/lib
sudo gem install sqlite3 -- --with-sqlite3-dir /opt/local/bin
which results in the following:
ERROR:  Error installing sqlite3-ruby:
    ERROR: Failed to build gem native extension.
/Users/folken/.rvm/rubies/ruby-1.9.2-head/bin/ruby extconf.rb --with-sqlite3-dir /usr/bin/sqlite3
*** 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
    --without-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/folken/.rvm/rubies/ruby-1.9.2-head/bin/ruby
    --with-sqlite3-dir
/Users/folken/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/mkmf.rb:1336:in `dir_config': undefined method `split' for true:TrueClass (NoMethodError)
    from extconf.rb:9:in `<main>'
Also under /Users/folken/.rvm/gems/ruby-1.9.2-head/gems: sqlite-ruby-2.2.3 sqlite3-1.3.3
Under RVM I have ruby-1.8.7 and the sqlite3 gem loads fine on that, but after much googling I have not found a solution that works for me. Any help is greatly appreciated (even if it involves manual installation / hackery to get working).
 
     
     
     
    