therubyracer install error

Question

As you can see below, libv8 installs fine, but therubyracer doesn't. I'm using Mac 10.7.4.

~/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1> gem install libv8
Building native extensions.  This could take a while...
Successfully installed libv8-3.11.8.3
1 gem installed
Installing ri documentation for libv8-3.11.8.3...
Installing RDoc documentation for libv8-3.11.8.3...

~/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1> gem install therubyracer
Building native extensions.  This could take a while...
ERROR:  Error installing therubyracer:
    ERROR: Failed to build gem native extension.

        /Users/rdp/.rvm/rubies/ruby-1.9.3-p125/bin/ruby extconf.rb
checking for main() in -lobjc... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

Provided configuration options:
    --with-opt-dir
    --with-opt-include
    --without-opt-include=${opt-dir}/include
    --with-opt-lib
    --without-opt-lib=${opt-dir}/lib
    --with-make-prog
    --without-make-prog
    --srcdir=.
    --curdir
    --ruby=/Users/rdp/.rvm/rubies/ruby-1.9.3-p125/bin/ruby
    --with-objclib
    --without-objclib
/Users/rdp/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
    from /Users/rdp/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:461:in `try_link0'
    from /Users/rdp/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:476:in `try_link'
    from /Users/rdp/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:619:in `try_func'
    from /Users/rdp/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:845:in `block in have_library'
    from /Users/rdp/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:790:in `block in checking_for'
    from /Users/rdp/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:284:in `block (2 levels) in postpone'
    from /Users/rdp/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:254:in `open'
    from /Users/rdp/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:284:in `block in postpone'
    from /Users/rdp/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:254:in `open'
    from /Users/rdp/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:280:in `postpone'
    from /Users/rdp/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:789:in `checking_for'
    from /Users/rdp/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/mkmf.rb:840:in `have_library'
    from extconf.rb:10:in `<main>'


Gem files will remain installed in /Users/rdp/.rvm/gems/ruby-1.9.3-p125/gems/therubyracer-0.10.1 for inspection.
Results logged to /Users/rdp/.rvm/gems/ruby-1.9.3-p125/gems/therubyracer-0.10.1/ext/v8/gem_make.out

Here's the mkmf.log, which is located in ~/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/gems/1.9/gems/therubyracer-0.10.1/ext/v8>.

File Edit Options Buffers Tools Help

"/usr/bin/gcc-4.2 -o conftest -I/Users/rdp/.rvm/rubies/ruby-1.9.3-p125/include/ruby-1.9.1/x86_64-darwin11.3.0 -I/Users/rdp/.rvm/rubies/ruby-1.9.3-p125/include/ruby-1.9.1/rub\
y/backward -I/Users/rdp/.rvm/rubies/ruby-1.9.3-p125/include/ruby-1.9.1 -I. -I/Users/rdp/.rvm/usr/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE    -O3 -ggdb -Wextra -Wno-unused-\
parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wshorten-64-to-32 -Wimplicit-functio\
n-declaration  -fno-common -pipe conftest.c  -L. -L/Users/rdp/.rvm/rubies/ruby-1.9.3-p125/lib -L/Users/rdp/.rvm/usr/lib -L.      -lruby.1.9.1  -lpthread -ldl -lobjc "
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main() {return 0;}
/* end */

Answer 1

On Mountain Lion 10.8, it doesn't come preinstalled with a C compiler. You'll need to download and install the 'command line tools' package from Apple themselves, and then run which gcc to confirm it is installed. Everything should run fine from there on in.

Answer 2

The solution that worked for me was putting these steps together on 10.7.4

export CC=gcc-4.2

sudo ln /usr/bin/gcc /usr/bin/gcc-4.2

gem uninstall libv8
gem install therubyracer

Answer 3

Mac 10.10.5, Ruby 2.1.0 this worked for me:

gem uninstall libv8
gem uninstall therubyracer

brew upgrade gcc
brew install v8

bundle config --local build.libv8 --with-cxx=/usr/local/bin/gcc-6
gem install libv8 -v '3.16.14.17' -- --with-system-v8
gem install therubyracer -- --with-v8-dir=/usr/local/opt/v8-315

bundle install # worked !

Answer 4

For Linux:

The code below is of course correct

$ gem uninstall libv8

$ gem install therubyracer

But sometimes it does't help because you haven't program make. AT FIRST you need install make. To do this, run:

sudo apt-get install build-essential

And only after that:

gem install therubyracer

Answer 5

You can use the Libv8 from the brew instead of the one from gem. You can do that by following commands:

$ gem uninstall libv8
$ brew install v8
$ gem install therubyracer