# Undefined symbol: rb\_Digest\_MD5\_Init

**URL:** <https://www.ruby-forum.com/t/undefined-symbol-rb-digest-md5-init/150788>\
**Category:** Ruby\
**Created:** [October 13, 2008, 10:22am UTC](https://www.ruby-forum.com/t/undefined-symbol-rb-digest-md5-init/150788 "2008-10-13T10:22:57Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![silent11](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/3d9bf3/32.png) [@silent11](https://www.ruby-forum.com/u/silent11)\
**Post date:** [October 13, 2008, 10:22am UTC](https://www.ruby-forum.com/t/undefined-symbol-rb-digest-md5-init/150788/1 "2008-10-13T10:22:57Z")

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Hi,

I am trying to run a program (s3sync) written in Ruby, but I am getting  
the following error. Its seems to be complaining about the md5.so I am  
using red hat 5.1 and ruby 1.8.7.

./s3sync.rb  
/usr/local/lib/ruby/1.8/i686-linux/digest/md5.so:  
/usr/local/lib/ruby/1.8/i686-linux/digest/md5.so: undefined symbol:  
rb\_Digest\_MD5\_Init - /usr/local/lib/ruby/1.8/i686-linux/digest/md5.so  
(LoadError)  
from /usr/local/lib/ruby/1.8/md5.rb:6  
from ./s3sync.rb:23:in `require’  
from ./s3sync.rb:23

Any ideas?

I verified that the file  
/usr/local/lib/ruby/1.8/i686-linux/digest/md5.so is on my filesystem.

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<div class="post-metadata">

**Author:** ![silent11](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/3d9bf3/32.png) [@silent11](https://www.ruby-forum.com/u/silent11)\
**Post date:** [October 13, 2008, 11:58am UTC](https://www.ruby-forum.com/t/undefined-symbol-rb-digest-md5-init/150788/2 "2008-10-13T11:58:39Z")

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Hi,

At Mon, 13 Oct 2008 17:20:10 +0900,  
Will Will wrote in [ruby-talk:317524]:

> I am trying to run a program (s3sync) written in Ruby, but I am getting  
> the following error. Its seems to be complaining about the md5.so I am  
> using red hat 5.1 and ruby 1.8.7.
> 
> ./s3sync.rb  
> /usr/local/lib/ruby/1.8/i686-linux/digest/md5.so:  
> /usr/local/lib/ruby/1.8/i686-linux/digest/md5.so: undefined symbol:  
> rb\_Digest\_MD5\_Init - /usr/local/lib/ruby/1.8/i686-linux/digest/md5.so  
> (LoadError)

Seems that md5init.o was compiled without openssl/md5.h but  
md5.o was with it or the routines in openssl are used. How did  
you compiled it?

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<div class="post-metadata">

**Author:** ![silent11](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/3d9bf3/32.png) [@silent11](https://www.ruby-forum.com/u/silent11)\
**Post date:** [October 13, 2008, 7:15pm UTC](https://www.ruby-forum.com/t/undefined-symbol-rb-digest-md5-init/150788/3 "2008-10-13T19:15:03Z")

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I had a similar issue last week with the md5.so and was advised to  
downgrade to Ruby 1.8.6. I did so and that particular issue I was  
having went away. Apparently there needs to be a complete recompile of  
the md5 source code for each platform in Ruby 1.8.7. I’m not sure who  
would be responsible to go do that.