问题
I installed icu on amazon ec2 with
sudo apt-get install libicu-dev
Then I installed charlock_holmes:
gem install charlock_holmes
It seemed to me that it was successfully installed:
Building native extensions. This could take a while...
Successfully installed charlock_holmes-0.6.9.4
1 gem installed
After that I got this:
.../shared/bundle/ruby/1.9.1/gems/charlock_holmes-0.6.9.4/lib/charlock_holmes.rb:1:in `require':
.../shared/bundle/ruby/1.9.1/gems/charlock_holmes-0.6.9.4/lib/charlock_holmes/charlock_holmes.so:
undefined symbol: _ZN6icu_518ByteSink15GetAppendBufferEiiPciPi
.../shared/bundle/ruby/1.9.1/gems/charlock_holmes-0.6.9.4/lib/charlock_holmes/charlock_holmes.so (LoadError)
I tried also to install using this command:
gem install charlock_holmes -- --with-icu-dir=/usr/local/lib/
The error still occures.
It seems to me that somehow I need to specify the right directory --with-icu-dir
The reason why I specified /usr/local/lib is because the icu libs are installed into that directory.
回答1:
gem install charlock_holmes -- --with-icu-dir=/usr/local
worked for me when I ran into this problem. The dependencies are smart enough to look up lib for libs, include for header files, and the rest where appropriate under /usr/local.
I got these nasty test errors when installing the gem:
unable to convert "\xD0" from ASCII-8BIT to UTF-8 for ext/charlock_holmes/dst/bin/file, skipping
unable to convert "\xEE" from ASCII-8BIT to UTF-8 for ext/charlock_holmes/src/file-5.08/magic/Magdir/wordprocessors, skipping
unable to convert "\xE5" from ASCII-8BIT to UTF-8 for ext/charlock_holmes/src/file-5.08/magic/Magdir/riff, skipping
unable to convert "\xE1" from ASCII-8BIT to UTF-8 for ext/charlock_holmes/src/file-5.08/magic/Magdir/linux, skipping
unable to convert "\xE1" from ASCII-8BIT to UTF-8 for ext/charlock_holmes/src/file-5.08/magic/Magdir/natinst, skipping
unable to convert "\xBD" from ASCII-8BIT to UTF-8 for ext/charlock_holmes/src/file-5.08/magic/Magdir/filesystems, skipping
unable to convert "\xE1" from ASCII-8BIT to UTF-8 for ext/charlock_holmes/src/file-5.08/ChangeLog, skipping
unable to convert "\xD0" from ASCII-8BIT to UTF-8 for ext/charlock_holmes/src/file-5.08/src/file, skipping
unable to convert "\xCF" from ASCII-8BIT to UTF-8 for test/fixtures/hello_world, skipping
but they didn't seem to impact my app when running.
来源：https://stackoverflow.com/questions/16716678/undefined-symbol-using-charlock-holmes-gem