Rspec errors in a Rails application using Nitrous.io - 'cannot open shared objects file'

When I start bundle exec rspec spec/, I get the following messages in the console:

Could not open library 'libgtkmm-2.4': libgtkmm-2.4: cannot open shared object file: No such file or directory.                                                                       
Could not open library 'libgtkmm-2.4.so': libgtkmm-2.4.so: cannot open shared object file:     No such file or directory.                                                                 
Could not open library 'libgtkmm-2.4.so.1': libgtkmm-2.4.so.1: cannot open shared object file: No such file or directory.                                                             
Could not open library 'libgtkmm-3.0': libgtkmm-3.0: cannot open shared object file: No such file or directory.                                                                       
Could not open library 'libgtkmm-3.0.so': libgtkmm-3.0.so: cannot open shared object file: No such file or directory.                                                                 
Could not open library 'libgtkmm-3.0.so.1': libgtkmm-3.0.so.1: cannot open shared object file: No such file or directory

But all tests pass, and my application works fine. Can someone fill me with what could happen? Should I just discard this box and clone my repo on a new one? I am using Ruby 2.0.0p247 and Rails 4.0.2 in the Nitrous.io field. Thanks.

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, ( Google ), Nitrogen Ubuntu . . , GTK - ( Linux).

Linux, libgtkmm, , .

Ubuntu , :

sudo apt-get install libgtkmm *

, .

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