1. Introduction
2. Installing MacPorts
2.1. Install X11
2.2. Install Xcode
2.3. Install MacPorts
2.4. MacPorts Upgrade
2.5. Uninstall
2.6. MacPorts and the Shell
3. Using MacPorts
3.1. The port Command
3.2. Port Variants
3.3. Common Tasks
3.4. Port Binaries
4. Portfile Development
4.1. Portfile Introduction
4.2. Creating a Portfile
4.3. Example Portfiles
4.4. Port Variants
4.5. Patch Files
4.6. Local Portfile Repositories
4.7. Portfile Best Practices
4.8. MacPorts' buildbot
5. Portfile Reference
5.1. Global Keywords
5.2. Global Variables
5.3. Port Phases
5.4. Dependencies
5.5. Variants
5.6. Tcl Extensions
5.7. StartupItems
5.8. Livecheck / Distcheck
5.9. PortGroups
6. MacPorts Internals
6.1. File Hierarchy
6.2. Configuration Files
6.3. Port Images
6.4. APIs and Libs
6.5. The MacPorts Registry
7. MacPorts Project
7.1. Using Trac for tickets
7.2. Contributing to MacPorts
7.3. Port Update Policies
7.4. MacPorts Membership
7.5. The PortMgr Team
8. MacPorts Guide Terms
Glossary
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Variants are a way for port authors to provide options for a port that may be chosen during the port install. To display the available variants, if any, use this command:

%% port variants fetchmail
fetchmail has the variants:
        universal
        ssl: Support secure connections using OpenSSL
        fetchmailconf: Install a graphical configurator
        ntlm: Enable NTLM authentication

Note

In some ports, you may find variants for which descriptions have not yet been written.

A variant can only be invoked when a port is installed. After you have determined what variants a given port has, if any, you may install a port using the variant as shown.

%% sudo port install fetchmail +ssl

Port variant execution may be verified using the port command with the verbose switch.

%% sudo port -v install fetchmail +ssl

When a port is installed using a valid variant and specified correctly, the verbose output will contain:

DEBUG: Executing variant ssl provides ssl

For an explanation of default variants see Port Variants. Default variants are optional, and not all ports using variants have them. For ports with default variants, you may install a port without them by negating default variants using - as shown.

%% sudo port install fetchmail -ssl

To verify that you have properly negated a default variant, you may want to use verbose mode. But negated variants are simply not reported in any way by the port command, as if they did not exist. You will know you have successfully negated the default variant in the example above if you do not see this line in the verbose output.

DEBUG: Executing variant ssl provides ssl