Installing ruby 1.8.6 on OSX

Table Of Contents ↓

UPDATED Removing native OSX’ ruby is a bad idea. Just use rvm or similar tool instead.

Restoring OSX ruby is pretty easy though: just copy your /System/Library/Ruby and /System/Library/Frameworks/Ruby.framework dirs from another OSX installation.

Setup Script (download)


Ruby on Osx

Ruby 1.8.7 is a default version(at the moment) OS X ships with.

root# ls -l /usr/bin/|grep 'Frameworks\/Ruby'
erb -> ../../System/Library/Frameworks/Ruby.framework/Versions/Current/usr/bin/erb
gem -> ../../System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/gem
irb -> ../../System/Library/Frameworks/Ruby.framework/Versions/Current/usr/bin/irb
rdoc -> ../../System/Library/Frameworks/Ruby.framework/Versions/Current/usr/bin/rdoc
ri -> ../../System/Library/Frameworks/Ruby.framework/Versions/Current/usr/bin/ri
ruby -> ../../System/Library/Frameworks/Ruby.framework/Versions/Current/usr/bin/ruby
testrb -> ../../System/Library/Frameworks/Ruby.framework/Versions/Current/usr/bin/testrb

To avoid possible conflicts I just uninstalled Ruby 1.8.7 by removing it along with symlinks.

# removing symlinks
sudo rm -f /usr/bin/{erb,gem,irb,rdoc,ri,ruby,testrb}

#Then remove installed wrappers:
grep -R '#!/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby' /usr/bin/|cut -d: -f1 |sudo xargs rm -f
#removing Ruby.framework
root# rm -rf /System/Library/Frameworks/Ruby.framework/

# once ruby186 port installed
# verify environment
gem env path
["~/.gem/ruby/1.8", "/opt/local/lib/ruby/gems/1.8"]

Notes, Rmagick

At the moment of writing, 6.6.1 is the latest ImageMagick’s version But when the rmagick-1.15.14 gem is built against it - gem fails with error:

dyld: NSLinkModule() error
dyld: Symbol not found: _DestroyConstitute
  Referenced from: /Users/marjanhratson/.gem/ruby/1.8/gems/rmagick-1.15.14/lib/RMagick.bundle
  Expected in: flat namespace
  in /Users/marjanhratson/.gem/ruby/1.8/gems/rmagick-1.15.14/lib/RMagick.bundle
Trace/BPT trap

To overcome this issue we need to fallback to older ImageMagic-6.5.6 version: read on

Notes, ruby

Besides above rmagick error, ruby wasn’t operable as stuck all the time. _GDB_ing showed issue:

(gdb) bt
#0  0x00007fff850eb7a2 in semaphore_wait_signal_trap ()
#1  0x00007fff850f0ced in pthread_mutex_lock ()

Google kindly suggested conversation with simlar issue. And dln.c patch worked for me as well.

Read More
Building Rmagick gem and how to avoid memory leak
Tracking Dotfiles with Git
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