Check if gem name version version is installed.
True if the requested gem has already been installed.
A string explanation of the conflict.
Does this dependency request match spec?
NOTE: match? only matches prerelease versions when dependency is a prerelease dependency.
Installing a git gem only involves building the extensions and generating the executables.
This is a null install as this specification is already installed. options are ignored.
This is a null install as a locked specification is considered installed. options are ignored.
Installs this specification using the Gem::Installer options. The install method yields a Gem::Installer instance, which indicates the gem will be installed, or nil, which indicates the gem is already installed.
After installation spec is updated to point to the just-installed specification.