我正在尝试安装EventMachine：
sudo gem install eventmachine
...
Building native extensions. This could take a while...
/Users/kuankuan/.rvm/rubies/ruby-1.9.3-p327/lib/ruby/1.9.1/rubygems/ext/builder.rb:48: warning: Insecure world writable dir /usr/local/bin/g4bin in PATH, mode 040777
ERROR: Error installing eventmachine:
ERROR: Failed to build gem native extension.
/Users/kuankuan/.rvm/rubies/ruby-1.9.3-p327/bin/ruby extconf.rb
/Users/kuankuan/.rvm/rubies/ruby-1.9.3-p327/lib/ruby/1.9.1/mkmf.rb:1344: warning: Insecure world writable dir /usr/local/bin/g4bin in PATH, mode 040777
checking for rb_trap_immediate in ruby.h,rubysig.h... no
checking for rb_thread_blocking_region()... yes
checking for inotify_init() in sys/inotify.h... no
checking for __NR_inotify_init in sys/syscall.h... no
checking for writev() in sys/uio.h... yes
checking for rb_thread_check_ints()... yes
checking for rb_time_new()... yes
checking for sys/event.h... yes
checking for sys/queue.h... yes
creating Makefile
make
compiling binder.cpp
cc1plus: error: unrecognized command line option "-arch"
make: *** [binder.o] Error 1
平台：
Mac OSX 10.8.3
Ruby 1.9.3p327 (2012-11-10) [x86_64-darwin12.2.0]
cc --version
Apple LLVM version 4.2 (clang-425.0.28) (based on LLVM 3.2svn)
Target: x86_64-apple-darwin12.3.0
Thread model: posix
gcc --version
gcc (MacPorts gcc44 4.4.7_6) 4.4.7
Copyright (C) 2010 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
g++ --version
g++ (MacPorts gcc44 4.4.7_6) 4.4.7
Copyright (C) 2010 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
命令行工具
我尝试更改捆绑包的配置：
sudo bundle config build.eventmachine --with-cflags=\"-O2 -pipe -march=native -w\"