How to set Ruby's load path externally
See the "Ruby and Its World" chapter from The Pickaxe Book, specifically the section on environment variables. Excerpt:
RUBYLIB Additional search path for Ruby programs ($SAFE must be 0). DLN_LIBRARY_PATH Search path for dynamically loaded modules. RUBYLIB_PREFIX (Windows only) Mangle the RUBYLIB search path by adding this prefix to each component.
Make sure that you've placed the installed
bin directory in your
$PATH for the
command to work. It should modify the
RUBYLIB itself, but if not, try Martin's answer to fix that.
Then, you can have your gem home (where the gems that rubygems installs are stored) be local.
$GEM_HOME (or set things up in your
~/.gemrc) and check that everything took with
% mkdir ~/.gems % export GEM_HOME=~/.gems % gem help environment Usage: gem environment [arg] [options] Common Options: -h, --help Get help on this command -V, --[no-]verbose Set the verbose level of output -q, --quiet Silence commands --config-file FILE Use this config file instead of default --backtrace Show stack backtrace on errors --debug Turn on Ruby debugging Arguments: packageversion display the package version gemdir display the path where gems are installed gempath display path used to search for gems version display the gem format version remotesources display the remote gem servers display everything Summary: Display information about the RubyGems environment Description: The RubyGems environment can be controlled through command line arguments, gemrc files, environment variables and built-in defaults. Command line argument defaults and some RubyGems defaults can be set in ~/.gemrc file for individual users and a /etc/gemrc for all users. A gemrc is a YAML file with the following YAML keys: :sources: A YAML array of remote gem repositories to install gems from :verbose: Verbosity of the gem command. false, true, and :really are the levels :update_sources: Enable/disable automatic updating of repository metadata :backtrace: Print backtrace when RubyGems encounters an error :bulk_threshold: Switch to a bulk update when this many sources are out of date (legacy setting) :gempath: The paths in which to look for gems gem_command: A string containing arguments for the specified gem command Example: :verbose: false install: --no-wrappers update: --no-wrappers RubyGems' default local repository can be overriden with the GEM_PATH and GEM_HOME environment variables. GEM_HOME sets the default repository to install into. GEM_PATH allows multiple local repositories to be searched for gems. If you are behind a proxy server, RubyGems uses the HTTP_PROXY, HTTP_PROXY_USER and HTTP_PROXY_PASS environment variables to discover the proxy server. If you are packaging RubyGems all of RubyGems' defaults are in lib/rubygems/defaults.rb. You may override these in lib/rubygems/defaults/operating_system.rb