macos - 如何获得端口的所有可用安装选项？

Question

基本上，我想安装opencv，以便它使用tbb和boost完整的源代码。但是我想我需要知道如何显示端口的所有可用安装选项。 (安装选项在端口名称后的意思是“+ sth”，这是您的称呼方式吗？)

在我的具体示例中，我的行开始于

sudo port install opencv +tbb +python27

但我不确定如何获得开发者和提升选项...

任何想法如何显示选项？还是专门针对opencv？
谢谢!

Answer 1

除了Barnabas Szabolcs提供的答案外，我还发现 info 命令有助于查找有关端口的更多信息，包括可用的变体，还提供了其他有趣的信息，例如软件许可证，维护人员等

port info opencv

上面的命令产生以下输出(从当前端口文件开始):

opencv @3.0.0_1 (graphics, science)
Variants:             contrib, dc1394, debug, eigen, java, opencl, openni,
                      python27, python34, qt4, qt5, tbb, universal, vtk

Description:          OpenCV is a library that is mainly aimed at real time
                      computer vision. Some example areas would be
                      Human-Computer Interaction (HCI), Object Identification,
                      Segmentation and Recognition, Face Recognition, Gesture
                      Recognition, Motion Tracking, Ego Motion, Motion
                      Understanding, Structure From Motion (SFM), and Mobile
                      Robotics.
Homepage:             http://opencv.org

Extract Dependencies: unzip
Build Dependencies:   cmake, pkgconfig
Library Dependencies: zlib, bzip2, libpng, jpeg, jasper, tiff, ilmbase, openexr,
                      ffmpeg
Platforms:            darwin
License:              BSD
Maintainers:          stromnov@macports.org, openmaintainer@macports.org