Unicorn fails to install even though it's already installed and running

[Mac Martine <99miles@gmail.com>]

I'm deploying a Rails 3.2.8 app to Ubuntu. The server already runs the app with Unicorn and Nginx. 
unicorn -v returns unicorn v4.4.0

Adn rvm gem list shows:
unicorn (4.4.0)

Yet when I manually run 'gem install unicorn '4.4.0' it fails with the following. Any ideas why?

    Installing unicorn (4.4.0)
     ** [out :: mydomain.net] with native extensions
     ** [out :: mydomain.net] 
     ** [out :: mydomain.net] Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
     ** [out :: mydomain.net] 
     ** [out :: mydomain.net] /home/eg/.rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb
     ** [out :: mydomain.net] checking for SIZEOF_OFF_T in ruby.h... *** extconf.rb failed ***
     ** [out :: mydomain.net] Could not create Makefile due to some reason, probably lack of
     ** [out :: mydomain.net] necessary libraries and/or headers.  Check the mkmf.log file for more
     ** [out :: mydomain.net] details.  You may need configuration options.
     ** [out :: mydomain.net] 
     ** [out :: mydomain.net] Provided configuration options:
     ** [out :: mydomain.net] --with-opt-dir
     ** [out :: mydomain.net] --with-opt-include
     ** [out :: mydomain.net] --without-opt-include=${opt-dir}/include
     ** [out :: mydomain.net] --with-opt-lib
     ** [out :: mydomain.net] --without-opt-lib=${opt-dir}/lib
     ** [out :: mydomain.net] --with-make-prog
     ** [out :: mydomain.net] --without-make-prog
     ** [out :: mydomain.net] --srcdir=.
     ** [out :: mydomain.net] --curdir
     ** [out :: mydomain.net] --ruby=/home/eg/.rvm/rubies/ruby-1.9.3-p194/bin/ruby
     ** [out :: mydomain.net] /home/eg/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
     ** [out :: mydomain.net] You have to install development tools first.
     ** [out :: mydomain.net] from /home/eg/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:491:in `block in try_compile'
     ** [out :: mydomain.net] from /home/eg/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:443:in `with_werror'
     ** [out :: mydomain.net] from /home/eg/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:491:in `try_compile'
     ** [out :: mydomain.net] from /home/eg/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:686:in `macro_defined?'
     ** [out :: mydomain.net] from /home/eg/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:822:in `block in have_macro'
     ** [out :: mydomain.net] from /home/eg/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:790:in `block in checking_for'
     ** [out :: mydomain.net] from /home/eg/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:284:in `block (2 levels) in postpone'
     ** [out :: mydomain.net] from /home/eg/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:254:in `open'
     ** [out :: mydomain.net] from /home/eg/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:284:in `block in postpone'
     ** [out :: mydomain.net] from /home/eg/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:254:in `open'
     ** [out :: mydomain.net] from /home/eg/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:280:in `postpone'
     ** [out :: mydomain.net] from /home/eg/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:789:in `checking_for'
     ** [out :: mydomain.net] 
     ** [out :: mydomain.net] from /home/eg/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/mkmf.rb:821:in `have_macro'
     ** [out :: mydomain.net] from extconf.rb:4:in `<main>'
     ** [out :: mydomain.net] 
     ** [out :: mydomain.net] 
     ** [out :: mydomain.net] Gem files will remain installed in /rails_apps/eg/production/shared/bundle/ruby/1.9.1/gems/unicorn-4.4.0 for inspection.
     ** [out :: mydomain.net] Results logged to /rails_apps/eg/production/shared/bundle/ruby/1.9.1/gems/unicorn-4.4.0/ext/unicorn_http/gem_make.out
     ** [out :: mydomain.net] 
     ** [out :: mydomain.net] An error occurred while installing unicorn (4.4.0), and Bundler cannot continue.
     ** [out :: mydomain.net] Make sure that `gem install unicorn -v '4.4.0'` succeeds before bundling.



Here's the content from what I _think_ is the relevant mkmf.log

    have_macro: checking for SIZEOF_SIZE_T in ruby.h... -------------------- yes
    
    "gcc -I/home/evergreen/.rvm/rubies/ruby-1.9.3-p194/include/ruby-1.9.1/x86_64-linux -I/home/eg/.rvm/rubies/ruby-1.9.3-p194/include/ruby-1.9.1/ruby/backward -I/home/eg/.rvm/rubies/ruby-1.9.3-p194/include/ruby-1.9.1 -I. -I/home/eg/.rvm/usr/include     -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration  -fPIC   -c conftest.c"
    checked program was:
    /* begin */
    1: #include "ruby.h"
    2:
    3: #include <ruby.h>
    4: /*top*/
    5: #ifndef SIZEOF_SIZE_T
    6: # error
    7: >>>>>> SIZEOF_SIZE_T undefined <<<<<<
    8: #endif
    /* end */
    
    --------------------
    
    have_macro: checking for SIZEOF_LONG in ruby.h... -------------------- yes
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