sqlite3 gem fails to install

I had an almost similar problem as you where I had sqlite3 installed and yet the sqlite3 gem would not install. I was seeing an error message as follows,

user-name-rajas-macbook-pro:rails3 user-namer$ gem install sqlite3
Building native extensions.  This could take a while...
    ERROR:  Error installing sqlite3:
    ERROR: Failed to build gem native extension.

        /Users/user-namer/.rvm/rubies/ruby-1.9.2-p180/bin/ruby extconf.rb
checking for sqlite3.h... yes
checking for sqlite3_libversion_number() in -lsqlite3... no
sqlite3 is missing. Try 'port install sqlite3 +universal'
or 'yum install sqlite3-devel' and check your shared library search path (the
location where your sqlite3 shared library is located).
*** 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:

Gem files will remain installed in /Users/user-namer/.rvm/gems/ruby-1.9.2-    p180@rails_3/gems/sqlite3-1.3.3 for inspection.
Results logged to /Users/user-namer/.rvm/gems/ruby-1.9.2-p180@rails_3/gems/sqlite3-    1.3.3/ext/sqlite3/gem_make.out

Here is what worked for me

gem install sqlite3 -- --with-sqlite3-dir=/opt/local

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