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I am having a problem trying to install the SQLite3 RubyGem. Here's what I'm doing:

$ sudo gem install --remote sqlite3-ruby

Here's the output:

Building native extensions.  This could take a while...
ERROR:  Error installing sqlite3-ruby:
    ERROR: Failed to build gem native extension.

/usr/bin/ruby1.8 extconf.rb
checking for fdatasync() in -lrt... yes
checking for sqlite3.h... no
*** 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 /usr/lib/ruby/gems/1.8/gems/sqlite3-ruby-1.2.5 for inspection.
Results logged to /usr/lib/ruby/gems/1.8/gems/sqlite3-ruby-1.2.5/ext/sqlite3_api/gem_make.out
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can you post the contents of /usr/lib/ruby/gems/1.8/gems/sqlite3-ruby-1.2.5/ext/sqlite3_api/gem_make.out – Sathya Jan 4 '10 at 14:58
the contents of that file ended up being exactly the same as what I originally posted – Andrew Jan 5 '10 at 4:16
is there a mkmf.log file in the same directory? – Sathya Jan 6 '10 at 11:42

Here's your answer:

First I install the Sqlite3 database:

sudo apt-get install sqlite3

After this we install the lib so we don’t get the error:

sudo apt-get install libsqlite3-dev

Now we can install the gem without the error:

sudo gem install sqlite3-ruby

The first command (installing sqlite3) may not be necessary.

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Worked for raspberry pi as well. – sam452 Jul 29 '15 at 13:56

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