title: Installation of the sqlite3-ruby gem fails
body: <p>whenever I try to install the gem:</p>
  
  <pre><code>gem install sqlite3-ruby
  </code></pre>
  
  <p>I get the following output:</p>
  
  <pre><code>D:/Ruby/bin/ruby.exe extconf.rb
  checking for sqlite3.h... no
  sqlite3.h is missing. Install SQLite3 from http://www.sqlite.org/ first.
  *** 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=D:/Ruby/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}/
  --enable-local
  --disable-local
  </code></pre>
  
  <p>I have properly installed sqlite3 on my Windows:</p>
  
  <pre><code>D:\&gt;sqlite3
  SQLite version 3.7.16.2 2013-04-12 11:52:43
  Enter ".help" for instructions
  Enter SQL statements terminated with a ";"
  sqlite&gt;
  </code></pre>
  
  <p>This is my second attempt of installation and again I get the same error message.</p>