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Constructs an Installer instance that will install the gem located at gem. options is a Hash with the following keys:

:bin_dir

Where to put a bin wrapper if needed.

:development

Whether or not development dependencies should be installed.

:env_shebang

Use /usr/bin/env in bin wrappers.

:force

Overrides all version checks and security policy checks, except for a signed-gems-only policy.

:format_executable

Format the executable the same as the ruby executable. If your ruby is ruby18, foo_exec will be installed as foo_exec18.

:ignore_dependencies

Don't raise if a dependency is missing.

:install_dir

The directory to install the gem into.

:security_policy

Use the specified security policy. See Gem::Security

:user_install

Indicate that the gem should be unpacked into the users personal gem directory.

:only_install_dir

Only validate dependencies against what is in the install_dir

:wrappers

Install wrappers if true, symlinks if false.

:build_args

An Array of arguments to pass to the extension builder process. If not set, then Gem::Command.build_args is used