这是错误日志，当我使用bundle install.
我想在Github上搭建一个博客，所以使用Octopress，但是没有成功。如果您有其他方法，请告诉我，谢谢。
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby extconf.rb
checking for main() in -lc... yes
creating Makefile
make "DESTDIR="
make: *** No rule to make target `"/Applications/Xcode', needed by `redcloth_attributes.o'. Stop.
Gem files will remain installed in /var/folders/zb/bxbkz6pd5fscs29zq2hk1b4h0000gn/T/bundler20141230-81071-q2p8fv/RedCloth-4.2.9/gems/RedCloth-4.2.9 for inspection.
Results logged to /var/folders/zb/bxbkz6pd5fscs29zq2hk1b4h0000gn/T/bundler20141230-81071-q2p8fv/RedCloth-4.2.9/gems/RedCloth-4.2.9/ext/redcloth_scan/gem_make.out
An error occurred while installing RedCloth (4.2.9), and Bundler cannot
continue.
Make sure that `gem install RedCloth -v '4.2.9'` succeeds before bundling.