在Mac OS上'sudo gem install eventmachine -v 1.0.8'时出错

Question

This is an error i'm facing while installing eventmachine on mac os, i've tried all answers but can't solve it till now and here is the error logs.

 <pre><code>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... no checking for rb_thread_blocking_region()... yes checking for ruby/thread.h... yes checking for rb_thread_call_without_gvl() in ruby/thread.h... 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_fd_select()... yes checking for rb_fdset_t in ruby/intern.h... yes checking for pipe2() in unistd.h... no checking for accept4() in sys/socket.h... no checking for SOCK_CLOEXEC in sys/socket.h... no checking for rb_wait_for_single_fd()... yes checking for rb_enable_interrupt()... no checking for rb_time_new()... yes checking for sys/event.h... yes checking for sys/queue.h... yes CFLAGS=$(cflags) -pipe -I/opt/local/include -Wall -Wextra -Wno-deprecated-declarations -Wno-ignored-qualifiers -Wno-unused-result CPPFLAGS=-D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT $(DEFS) $(cppflags) -Wall -Wextra -Wno-deprecated-declarations -Wno-ignored-qualifiers -Wno-unused-result checking for clock_gettime()... no checking for gethrtime()... no creating Makefile make "DESTDIR=" clean make "DESTDIR=" compiling binder.cpp In file included from binder.cpp:20:0: project.h:29:20: fatal error: iostream: No such file or directory #include <iostream> ^ compilation terminated. make: *** [binder.o] Error 1 make failed, exit code 2 Gem files will remain installed in /usr/local/lib/ruby/gems/2.1.0/gems/eventmachine-1.0.8 for inspection. Results logged to /usr/local/lib/ruby/gems/2.1.0/extensions/x86_64-darwin-15/2.1.0-static/eventmachine-1.0.8/gem_make.out</code></pre> 

please any help would be appreciated.

Answer 1

This is your problem:

make "DESTDIR="
compiling binder.cpp
In file included from binder.cpp:20:0:
project.h:29:20: fatal error: iostream: No such file or directory
#include <iostream>

What's occurring is that the compiler cannot find project.h's include iostream. You could play around with installing it manually, link provided below.

https://github.com/eventmachine/eventmachine/wiki/Building-EventMachine

This link may help solve your problem.

C++ Hello World trouble on OSX10.8

Another potential quick fix is to install it manually and see if adding the header extension will solve your issue.

#include <iostream.h>

Answer 2

If you are using Mac OSX el captain, openssl headers are not installed by default therefore try installing openssl. If openssl is already installed try to relink using following command

brew link openssl --force

See this issue for more detail - https://github.com/eventmachine/eventmachine/issues/643