ruby-on-rails - 安装失败 "gem install eventmachine"。我的项目中需要八哥，对于八哥我需要安装 eventmachine

Question

我的控制台上出现以下错误

root@comp09:~# gem install eventmachine
Building native extensions.  This could take a while...
ERROR:  Error installing eventmachine:
 ERROR: Failed to build gem native extension.

/usr/local/bin/ruby extconf.rb
checking for rb_trap_immediate in ruby.h,rubysig.h... yes
checking for rb_thread_blocking_region()... no
checking for inotify_init() in sys/inotify.h... yes
checking for writev() in sys/uio.h... yes
checking for rb_thread_check_ints()... no
checking for rb_time_new()... yes
checking for sys/event.h... no
checking for epoll_create() in sys/epoll.h... yes
creating Makefile

make
I. -I/usr/local/lib/ruby/1.8/x86_64-linux -I/usr/local/lib/ruby/1.8/x86_64-linux -I. -DBUILD_FOR_RUBY -DHAVE_RB_TRAP_IMMEDIATE -DHAVE_RBTRAP -DHAVE_INOTIFY_INIT -DHAVE_INOTIFY -DHAVE_WRITEV -DHAVE_WRITEV -DHAVE_RB_TIME_NEW -DOS_UNIX -DHAVE_EPOLL_CREATE -DHAVE_EPOLL -DWITH_SSL    -fPIC -O2 -g -Wall -Wno-parentheses -Wno-long-long     -o rubymain.o -c rubymain.cpp
make: I.: Command not found
make: [rubymain.o] Error 127 (ignored)
I. -I/usr/local/lib/ruby/1.8/x86_64-linux -I/usr/local/lib/ruby/1.8/x86_64-linux -I. -DBUILD_FOR_RUBY -DHAVE_RB_TRAP_IMMEDIATE -DHAVE_RBTRAP -DHAVE_INOTIFY_INIT -DHAVE_INOTIFY -DHAVE_WRITEV -DHAVE_WRITEV -DHAVE_RB_TIME_NEW -DOS_UNIX -DHAVE_EPOLL_CREATE -DHAVE_EPOLL -DWITH_SSL    -fPIC -O2 -g -Wall -Wno-parentheses -Wno-long-long     -o em.o -c em.cpp
make: I.: Command not found

如有任何帮助和建议，我们将不胜感激。

Answer 1

我在 Ubuntu 11.10 安装 eventmachine 时遇到了类似的问题。
区别在于(靠近日志末尾)

make: g++: Command not found

而不是

make: I.: Command not found

此问题与 GCC 上的 C++ 有关，可通过安装 build-essential 解决

sudo apt-get install build-essential