Could not open library

[movihus]

I'm trying to deploy an application that uses tesseract-ocr with passenger and when I open the website I see this error:
Could not open library '/tmp/.ffi-inline-500/985899750dd2ded7660e51be030ff964c9d21dc8.so': libtesseract.so.3: cannot open shared object file: No such file or directory (LoadError)

I have installed:
tesseract 3.02.02
leptonica-1.70
libjpeg 6b : libpng 1.2.49 : libtiff 3.9.4 : zlib 1.2.3

What could I do?.
Thanks in advance.

[movihus]

I'm using rbenv 0.4.0-89-g14bc162 with ruby 2.0.0p353 (2013-11-22 revision 43784) [x86_64-linux] on a CentOS release 6.4

[movihus]

I have run sudo ldconfig after installing tesseract but I get the same error

[meh]

Is the file actually present?

Is the LDPATH environment variable proper?

[movihus]

After a lot of work I could run the web app, but now I possibly discovered a bug.
I got this output when I want to use Tesseract::Engine

index >= 0 && index < size_used_:Error:Assert failed:in file ../ccutil/genericvector.h, line 512
/home/deployer/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/tesseract-ocr-0.1.5/lib/tesseract/api.rb:157: [BUG] Segmentation fault
ruby 2.0.0p353 (2013-11-22 revision 43784) [x86_64-linux]

All the trace here https://gist.github.com/movihus/226e7a4f49ff4fc6ad0e#file-gistfile1-txt

[meh]

What's the code that caused it?

[movihus]

I tried with this code:

path = 'image.jpg'
engine = Tesseract::Engine.new()
result = engine.text_for(path)

[meh]

Could you post the image as well please?

[movihus]

I tried with different images, for example this:

[meh]

I pushed a new gem version since it works for me on master, can you try with this new version please?

[movihus]

I installed and now I have compilation errors:

g++ -shared -fPIC -o /tmp/.ffi-inline-500/f6b0bffaa19644042f282b7bf04377398eed387c.so /tmp/.ffi-inline-500/f6b0bffaa19644042f282b7bf04377398eed387c.cpp -ltesseract 2>>/tmp/.ffi-inline-500/f6b0bffaa19644042f282b7bf04377398eed387c.log
/tmp/.ffi-inline-500/f6b0bffaa19644042f282b7bf04377398eed387c.cpp:1:30: error: tesseract/strngs.h: No existe el fichero o el directorio
/home/deployer/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/tesseract-ocr-0.1.6/lib/tesseract/c.rb:57: error: expected constructor, destructor, or type conversion before ‘*’ token
/home/deployer/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/tesseract-ocr-0.1.6/lib/tesseract/c.rb:63: error: se declaró la variable o campo ‘destroy_string’ como void
/home/deployer/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/tesseract-ocr-0.1.6/lib/tesseract/c.rb:63: error: ‘STRING’ no se declaró en este ámbito
/home/deployer/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/tesseract-ocr-0.1.6/lib/tesseract/c.rb:63: error: ‘value’ no se declaró en este ámbito
/home/deployer/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/tesseract-ocr-0.1.6/lib/tesseract/c.rb:69: error: ‘STRING’ no se declaró en este ámbito
/home/deployer/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/tesseract-ocr-0.1.6/lib/tesseract/c.rb:69: error: ‘value’ no se declaró en este ámbito
/home/deployer/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/tesseract-ocr-0.1.6/lib/tesseract/c.rb:69: error: expected ‘,’ or ‘;’ before ‘{’ token
/home/deployer/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/tesseract-ocr-0.1.6/lib/tesseract/c.rb:75: error: ‘STRING’ no se declaró en este ámbito
/home/deployer/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/tesseract-ocr-0.1.6/lib/tesseract/c.rb:75: error: ‘value’ no se declaró en este ámbito
/home/deployer/.rbenv/versions/2.0.0-p353/lib/ruby/gems/2.0.0/gems/tesseract-ocr-0.1.6/lib/tesseract/c.rb:75: error: expected ‘,’ or ‘;’ before ‘{’ token

I found this thread #7, but it supposses I installed the tesseract-devel package,
I use this method: https://github.com/grossws/tesseract-ocr-specs

yum list | grep tesseract*
tesseract.x86_64 3.02-1.el6 @/tesseract-3.02-1.el6.x86_64
tesseract-devel.x86_64 3.02-1.el6 @/tesseract-devel-3.02-1.el6.x86_64

yum list | grep leptonica*
leptonica.x86_64 1.69-1.el6 @/leptonica-1.69-1.el6.x86_64
leptonica-devel.x86_64 1.69-1.el6 @/leptonica-devel-1.69-1.el6.x86_64

[movihus]

I think I missed the issue, #3 is the correct

[movihus]

I found the headers in /home/makerpm/rpmbuild/BUILD/tesseract-ocr/ccutil/, copy it to /home/deployer/rpmbuild/BUILD/tesseract-ocr/ccutil/ (to have the correct permissions), modified my ~/.bashrc adding:

export CFLAGS=-I/home/deployer/rpmbuild/BUILD/tesseract-ocr/ccutil/

And the libs copied to /home/deployer/rpmbuild/BUILD/tesseract-ocr/api/.libs and then added to .bashrc

export LDFLAGS=-L/home/deployer/rpmbuild/BUILD/tesseract-ocr/api/.libs

But when I try to access the console througth rails console I get the same error.

What I'm doing wrong?.

[meh]

I don't know, I don't use the system you use.

[danielpclark]

For me compiling and installing the latest Leptonica http://leptonica.org/download.html fixed this. The apt-get repository version won't suffice.

[pgericson]

Solution for Redhat installation of leptonica and tesseract with the correct arguments to make it run

inspired from this .sh install file which did not work completely for me

yum -y update
yum -y install libstdc++ autoconf automake libtool autoconf-archive pkg-config gcc gcc-c++ make libjpeg-devel libpng-devel libtiff-devel zlib-devel

#Install AutoConf-Archive
wget ftp://mirror.switch.ch/pool/4/mirror/epel/7/ppc64/a/autoconf-archive-2016.09.16-1.el7.noarch.rpm
rpm -i autoconf-archive-2016.09.16-1.el7.noarch.rpm

# install leptonica from github
wget https://github.com/DanBloomberg/leptonica/archive/v1.72.tar.gz
tar -zxvf v1.72.tar.gz
cd leptonica-1.72
chmod +x configure # this is only if you have permission problems.
./configure --prefix=$HOME/local/
make
make install
cd ..

# install tesseract from github
wget https://github.com/tesseract-ocr/tesseract/archive/3.04.01.tar.gz
tar -zxvf 3.04.01.tar.gz
cd tesseract-3.04.01/
./autogen.sh
LIBLEPT_HEADERSDIR=$HOME/local/include ./configure --prefix=$HOME/local/ --with-extra-libraries=$HOME/local/lib
make
make install

LD_LIBRARY_PATH=#{home_dir}/local/lib CFLAGS=-I#{home_dir}/local/include LDFLAGS=-L#{home_dir}/local/lib bundle exec irb -r 'tesseract'
# you should see no errors

This will solve this issue and issue #3

I might be important to add $HOME/local/lib into /etc/ld.so.conf and run sudo ldconfig