title: Error installing ffi
body: <p>Can seem to get around this.</p>
  
  <pre><code>$gem install ffi
  Building native extensions.  This could take a while...
  ERROR:  Error installing ffi:
  ERROR: Failed to build gem native extension.
  
  /remote/part/usern/.rvm/rubies/ruby-1.9.3-p448/bin/ruby extconf.rb
  checking for ffi.h... no
  checking for ffi.h in /usr/local/include,/usr/include/ffi... no
  checking for rb_thread_blocking_region()... yes
  checking for rb_thread_call_with_gvl()... yes
  checking for rb_thread_call_without_gvl()... yes
  checking for ffi_prep_cif_var()... no
  creating extconf.h
  creating Makefile
  
  make
  libffi.gnu.mk:16: Extraneous text after `else' directive
  libffi.gnu.mk:18: *** only one `else' per conditional.  Stop.
  
  
  Gem files will remain installed in /remote/part/usern/.rvm/gems/ruby-1.9.3-p448@myrailsapp/gems/ffi-1.9.0 for inspection.
  Results logged to /remote/part/usern/.rvm/gems/ruby-1.9.3-p448@myrailsapp/gems/ffi-1.9.0/ext/ffi_c/gem_make.out
  </code></pre>
  
  <p>Any ideas?</p>