报错如下：
sudo gem install jekyll Password: Building native extensions. This could take a while... ERROR: Error installing jekyll: ERROR: Failed to build gem native extension. /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby extconf.rb creating Makefile make "DESTDIR=" clean make "DESTDIR=" compiling porter.c porter.c:359:27: warning: '&&' within '||' [-Wlogical-op-parentheses] if (a > 1 || a == 1 && !cvc(z, z->k - 1)) z->k--; ~~ ~~~~~~~^~~~~~~~~~~~~~~~~~~~ porter.c:359:27: note: place parentheses around the '&&' expression to silence this warning if (a > 1 || a == 1 && !cvc(z, z->k - 1)) z->k--; ^ ( ) 1 warning generated. compiling porter_wrap.c linking shared-object stemmer.bundle clang: error: unknown argument: '-multiply_definedsuppress' [-Wunused-command-line-argument-hard-error-in-future] clang: note: this will be a hard error (cannot be downgraded to a warning) in the future make: *** [stemmer.bundle] Error 1 make failed, exit code 2 Gem files will remain installed in /Library/Ruby/Gems/2.0.0/gems/fast-stemmer-1.0.2 for inspection. Results logged to /Library/Ruby/Gems/2.0.0/extensions/universal-darwin-13/2.0.0/fast-stemmer-1.0.2/gem_make.out
This is due to Xcode 5.1 - its already reported as a bug to Ruby.
I found three different ways to fix the bug:
- Install using:
sudo ARCHFLAGS=-Wno-error=unused-command-line-argument-hard-error-in-future gem install jekyll
- Install Ruby 2.1.1. You can do this using
brew install ruby(http://brew.sh/) - Follow the instructions from http://stackoverflow.com/a/22340285/1270034 to remove the offending arg from rbconfig.