Using Ruby module: dyld: lazy symbol binding failed: Symbol not found: _libiconv_open

[priancho]

System environment:

OS: OS X Lioon 10.7.5
RVM: rvm 1.22.18
Ruby: ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64_darwin11]

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I tried to use ruby extension of SimString.
It was successfully compiled, but when I ran the sample_unicode.rb (sample.rb runs without any problem) faced the following error messages.

$ ruby sample_unicode.rb

dyld: lazy symbol binding failed: Symbol not found: _libiconv_open
Referenced from: /Users/priancho/work/PubDictionaries/simstring-1.0/swig/ruby/simstring.bundle
Expected in: flat namespace

dyld: Symbol not found: _libiconv_open
Referenced from: /Users/priancho/work/PubDictionaries/simstring-1.0/swig/ruby/simstring.bundle
Expected in: flat namespace

Trace/BPT trap: 5

It seems that the problem comes from two libiconv libraries: one is OS X default library in /usr/lib and the other one is installed by MacPorts in /opt/local/lib.

Googling didn't give much information, but finally one of them worked for me.

In the simstring-1.0/swig/ruby/extconf.rb, put the following line before the create_makefile command as follows.

require 'mkmf'
$CFLAGS='-I../../include'
$LDFLAGS="-lstdc++"

have_library("iconv", "libiconv_open")
create_makefile('simstring')

Then, sample_unicode.rb started work fine.

However, I could not figure out why this one line fixes the problem :-(