brew link jpeg issues

问题

I am trying to install opencv on Mac OSX Lion.

brew install opencv

I get the following error (and a few other similar ones)

Error: The linking step did not complete successfully
The formula built, but is not symlinked into /usr/local
You can try again using `brew link jpeg'

When I do

brew link jpeg
Linking /usr/local/Cellar/jpeg/8d... ln: wrjpgcom: File exists

I do not understand what this means? What should I be doing? Thanks

回答1:

Check for the following files in the /usr/local folder:

bin/cjpeg
bin/djpeg
bin/jpegtran
bin/rdjpgcom
bin/wrjpgcom
include/jconfig.h
include/jerror.h
include/jmorecfg.h
include/jpeglib.h
lib/libjpeg.8.dylib
lib/libjpeg.a
share/man/man1/cjpeg.1
share/man/man1/djpeg.1
share/man/man1/jpegtran.1
share/man/man1/rdjpgcom.1
share/man/man1/wrjpgcom.1

For brew link jpegto succeed:

1. Remove (and backup) any of the aforementioned files
2. launch brew link jpeg again.

回答2:

Find the file wrjpgcom outside the Cellar and delete it.

The problem is Homebrew is trying to symlink that file into /usr/local but the destination for the symlink already exists as another file.

来源：https://stackoverflow.com/questions/9762943/brew-link-jpeg-issues