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Tatsuhiko Miyagawa


carton-install - Install the dependencies


  carton install [--deployment] [--path=PATH] [modules...]


Install the dependencies for your application. This command has two modes and the behavior is slightly different.


carton install <name>

If you run carton install with the arguments, carton will fetch and install the modules given as arguments.

carton install (no arguments)

If you run carton install without any arguments and if a build file (Makefile.PL or Build.PL) exists, carton will scan dependencies from the build file and install the modules.

In either way, if you run carton install for the first time (i.e. carton.lock does not exist), carton will fetch all the modules specified, resolve dependencies and install all required modules from CPAN.

If carton.lock file does exist, carton will still try to install modules specified or updated in the build file, but uses carton.lock for the dependency resolution, and then cascades to CPAN.

carton will analyze all the dependencies and their version information, and it is saved into carton.lock file. It is important to add carton.lock file into a version controlled repository and commit the changes as you update your dependencies.


If you specify the --deployment command line option or the carton.lock exists and your build file does not exist, carton will fetch all remote modules and use the dependencies specified in the carton.lock instead of resolving dependencies.


carton install doesn't update the modules already installed into local library path as long as the version is satisfied.

For example, one day you install URI-1.50 from CPAN:

  > carton install URI
  Successfully installed URI-1.50

Few weeks later, URI module is updated to 1.51 on CPAN. If you run the carton install URI again:

  > carton install URI
  You have URI (1.50)

because you haven't specified the version number, carton won't update the module in your local library path. If you want to update to the latest version of CPAN, you can either use carton update command, or specify the required version either in your build file or a command line argument:

 > carton install URI~1.51
 > carton update URI

 > cat Makefile.PL
 requires 'URI', 1.51;

Any of those will upgrade URI to the latest one from CPAN, and the version specified in the carton.lock will be bumped.



Force the deployment mode and carton will ignore build file contents.


Specify the path to install modules to. Defaults to local in the current directory.