Error while trying to install zsteg

While trying to install zsteg on Ubuntu Server (Linux 4.8.0-49-generic x86_64) I encounter the following error:

$ sudo gem install zsteg
Building native extensions. This could take a while...
ERROR: Error installing zsteg: ERROR: Failed to build gem native extension. current directory: /var/lib/gems/2.3.0/gems/rainbow-2.2.2/ext
/usr/bin/ruby2.3 mkrf_conf.rb
current directory: /var/lib/gems/2.3.0/gems/rainbow-2.2.2/ext
/usr/bin/ruby2.3 -rubygems /usr/share/rubygems-integration/all/gems/rake-10.5.0/bin/rake RUBYARCHDIR=/var/lib/gems/2.3.0/extensions/x86_64-linux/2.3.0/rainbow-2.2.2 RUBYLIBDIR=/var/lib/gems/2.3.0/extensions/x86_64-linux/2.3.0/rainbow-2.2.2
/usr/bin/ruby2.3: No such file or directory -- /usr/share/rubygems-integration/all/gems/rake-10.5.0/bin/rake (LoadError)
rake failed, exit code 1
Gem files will remain installed in /var/lib/gems/2.3.0/gems/rainbow-2.2.2 for inspection.
Results logged to /var/lib/gems/2.3.0/extensions/x86_64-linux/2.3.0/rainbow-2.2.2/gem_make.out

ruby2.3, ruby-dev and rake are installed

and also tried:

gem update --system

If I don't use sudo, I get:ERROR: While executing gem ... (Gem::FilePermissionError) You don't have write permissions for the /var/lib/gems/2.3.0 directory.

Please help.

1 Answer

I just reinstalled rake and zsteg and it worked for me.

1. make sure you have ruby-dev
2. update --system
3. sudo gem install rake
4. sudo gem install zsteg