How to get the EventMachine gem to compile on OSX Lion 10.8.2 with Xcode 4.5.1

Question

I looked everywhere I can find but can't seem to find a solution to this.

I'm using Xcode 4.5.1 on Lion 10.8.2, and am trying to run bundle for a Rails project and it keeps jamming up on this. I'm using the Thin gem for Heroku.

Bolanos@Jeremys-Mac-mini ⦿-1.9.3 fishfarm $ sudo gem install eventmachine
Password:
Building native extensions.  This could take a while...
ERROR:  Error installing eventmachine:
    ERROR: Failed to build gem native extension.

        /Users/Bolanos/.rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb
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
make: g++-4.2: No such file or directory
make: *** [binder.o] Error 1


Gem files will remain installed in /Users/Bolanos/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/eventmachine-1.0.0 for inspection.
Results logged to /Users/Bolanos/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/gems/1.9.1/gems/eventmachine-1.0.0/ext/gem_make.out

For now I'm having to do without Thin. Does anyone have a solution?

Where's your g++? Have you installed the command line tools for Xcode? — halfelf, Oct 16 '12 at 06:14
yes, I installed the tools - it works in all my other apps and I can create a new one and install thin and it works - it just won't work with this specific app. — jbolanos, Oct 16 '12 at 16:35
I decided to delete my app and start over fresh from git and it works - never figured out that one app wouldn't work. — jbolanos, Oct 16 '12 at 16:41

score 13 · Answer 1 · edited Jan 02 '20 at 22:29

13

Also check for a symlink:

$ sudo ln -s /usr/bin/g++ /usr/bin/g++-4.2

edited Jan 02 '20 at 22:29

the Tin Man

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answered Feb 20 '13 at 00:51

Kien Pham

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This seems like the correct answer to me, given the error is `make: g++-4.2: No such file or directory` – Mike Feb 26 '13 at 16:09

score 3 · Accepted Answer · edited Jan 02 '20 at 22:19

3

You have to install the Command Line Tools package from developer.apple.com.

Also I was having troubles with the MacOSX10.6.sdk because some headers were missing there, so I installed the MacOSX10.5.sdk and all worked fine.

edited Jan 02 '20 at 22:19

the Tin Man

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answered Oct 16 '12 at 07:07

Mikhail Kochegarov

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score 2 · Answer 3 · edited Jan 02 '20 at 22:20

2

I had the exact error, and creating a new symlink for the missing resource /usr/bin/g++-4.2 worked for me.

In my setup I pointed at the location in Cellar:

/usr/local/Cellar/apple-gcc42/4.2.1-5666.3/bin/g++-4.2

edited Jan 02 '20 at 22:20

the Tin Man

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answered Mar 03 '13 at 03:23

Shannon Perkins

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score 1 · Answer 4 · answered Feb 27 '13 at 19:42

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If none of the above work for you, I did

sudo ln -s /usr/bin/llvm-g++-4.2 /usr/bin/g++-4.2

and it worked like a charm. Running OS X 10.8.2.

answered Feb 27 '13 at 19:42

apb

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score 1 · Answer 5 · edited Jan 02 '20 at 22:23

You should have both:

Xcode command line tool: Detailed instructions for installation are in "How to install Xcode Command Line Tools".
Apple-gcc* compiler: I should mention that compiling with gcc48 and gcc49 fails. Therefore, installing apple-gcc42 (if you don't have) and choosing the compiler via MacPorts will solve the problem. You can see the installed gcc versions using:

port select --list gcc

You should see something like this where "mp-" stands for MacPorts own port:

Available versions for gcc:
         apple-gcc42 (active)
         current_saved
         mp-gcc48
         mp-gcc49

If you don't have "apple-gcc*" you may install it via:

port install apple-gcc42

after that chose the compiler:

port select --set gcc apple-gcc42

Now you may run:

 gem install eventmachine

This should solve the problem of errors which arise during building gem native extensions on OSX.

How to get the EventMachine gem to compile on OSX Lion 10.8.2 with Xcode 4.5.1

5 Answers5

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