ruby on rails - Error when trying to install therubyracer -

When I try to install Mani thermbreser , I receive this error: / P>

  Mane installed Thermbreaker Building Basic Extensions. This may take a while ... Error: Error installing thumbnailer: Error: Failed to create gem country extension /opt/ruby-enterprise-1.8.7-2012.02/bin/ruby extconf.rb check for main () - lpthread ... yes warning! Libv8 ~ & gt; Unable to load 3.16.14. *** extconf.rb failed *** Could not make Makefile due to some reason, maybe there is a lack of necessary libraries and / or headers Check the mkmf.log file for more information. You may need configuration options. Configurable options available: - With-Opt-Direction - Without - OPTION DIRECTION - OP-IN - WITHOUT OPTION = $ {opt-dir} / include --with-opt-lib-without-opt-in -lib = $ {opt-dir} / lib - with-makeup -pag - without-make-handling --srcdir =. --Cardir - RBI = / opt / Rabbi-Enterprise-1.8.7-2012.02 / bin / Rabbi - with-perthable - non-perlabelable -enabled-debug-disable-debug / opt / ruby-enterprise- 1.8.7.2012.02 / Lib / ruby ​​/ site_ruby / 1.8 / rubygems / custom_require.rb: 36: `gem_original_require ': There is no such file to load - /opt/ruby-enterprise-1.8.7- to libv8 (LoadError) 2012.02 / lib / ruby ​​/ site_ruby / 1.8 / rubygems / custom_require.rb: 36: In `requirement 'from extconf.rb: 29 gem files will be installed in /home/speedup18meses/.gems/gems/therubyracer-0.12.1 . inspection. Login results in /home/speedup18meses/.gems/gems/therubyracer-0.12.1/ext/v8/gem_make.out  

I use shared servers, therefore, me sudo I do not have access to my user I'm using it on a Rail app I tried to:

  Install Gem Install libv8 -v '3.16.14.3' - along with system- Install V8 Gem Thermosolaser  

.

I tried to install an especific version, and edit Gemfile, but neither works.

I'm using it on a rail app

Then add the line to your Gemfile:

  Mani 'thermbuser' then do it:  
  $ bundle Install  
 
 Then the bundler will handle the dependencies installed. 
 
 
 When I try to install brain thermometer, I get this error: 
 
 
 I do not get that error throw your computer and your Find the computer with the software I have installed.