Question

I’m trying to install Rails 3.2.8 to a linux box without internet connection. I’ve manually downloaded all the related gem packages and copied them to the linux box. When I try to install some of those packages, I got error. e.g., :

[jw@web gems]$ sudo /usr/local/bin/gem install --local ./activemodel-3.2.8.gem
ERROR:  While executing gem ... (Gem::DependencyError)
    Unable to resolve dependencies: activemodel requires builder (~> 3.0.0)

The strange thing is that some packages can be installed this way. e.g., the builder has already been installed. Please note that all the dependencies required are there.

How come the dependencies is unable to resolve ?

My environment:

Ruby: ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-linux]
Rubygem: 1.8.23

My installed gems:

[jw07@web gems]$ gem list

*** LOCAL GEMS ***

activesupport (3.2.8)
arel (3.0.2)
bigdecimal (1.1.0)
builder (3.1.3)
bundler (1.2.0)
erubis (2.7.0)
hike (1.2.1)
i18n (0.6.1)
io-console (0.3)
journey (1.0.4)
json (1.7.5)
mail (2.4.4)
mime-types (1.19)
minitest (2.5.1)
multi_json (1.3.6)
polyglot (0.3.3)
rack (1.4.1)
rack-cache (1.2)
rack-ssl (1.3.2)
rack-test (0.6.1)
rake (0.9.2.2)
rdoc (3.9.4)
sprockets (2.5.0)
thor (0.16.0)
tilt (1.3.3)
treetop (1.4.10)
tzinfo (0.3.33)

Answer 1

It does not look like Rubygems version is a problem.

You see rails requires gem builder ~> 3.0.0, but you have 3.1.3 which does not match (~> means it will match 3.0.x, but not 3.1.x). You have to install builder 3.0.3.

Another possibility could be there is another gem in your Gemfile that requires builder 3.1.x, causing a conflict. It would be helpful if you provided your Gemfile.