Introduction to Ruby

The Ruby package contains the Ruby development environment. This is useful for object-oriented scripting.



Development versions of BLFS may not build or run some packages properly if LFS or dependencies have been updated since the most recent stable versions of the books.

Package Information

  • Download (HTTP):

  • Download MD5 sum: 377853f31d10bfe37c58b8537fc3e05d

  • Download size: 14 MB

  • Estimated disk space required: 694 MB (add 1.0 GB for C API docs)

  • Estimated build time: 1.2 SBU (using parallelism=4; add 4.6 SBU for tests; add 0.6 SBU for C API docs)

Ruby Dependencies




Berkeley DB-5.3.28, Doxygen-1.9.8, Graphviz-9.0.0, rustc-1.73.0, Tk-8.6.13, Valgrind-3.21.0, and DTrace

Installation of Ruby

Install Ruby by running the following command:

./configure --prefix=/usr      \
            --enable-shared    \
            --without-valgrind \
            --without-baseruby \
            --docdir=/usr/share/doc/ruby-3.2.2 &&

Optionally, build the CAPI documents by running the following commands:

make capi

The tests require that the new version of Ruby is already installed to run correctly. If you want to run the tests, execute them after installing the package.

Now, as the root user:

make install

To test the results, issue: make -k check. There are over 25,000 tests. Some tests related to ipv6 may indicate errors. If the tests are run in a directory that has a world writable component (e.g. /tmp) then several additional tests may fail. A few tests may fail due to system configuration expectations.



If you have Ruby-On-Rails applications installed and did an upgrade of Ruby by installing this package, you might need to run an update there, too (as the root user):

cd /path/to/web/app
bundle update rake

and restart the webserver which serves the application.

Command Explanations

--enable-shared: This switch enables building the libruby shared library.

--without-baseruby: This switch prevents using the system ruby if it is already installed. The build system will use the newly built version instead.

--disable-install-doc: This switch disables building and installing rdoc indexes and C API documents.

--disable-install-rdoc: This switch disables building and installing rdoc indexes.

--disable-install-capi: This switch disables building and installing C API documents.


Installed Programs: bundle, bundler, erb, gem, irb, racc, rake, rbs, rdbg, rdoc, ri, ruby, and typeprof
Installed Libraries:
Installed Directories: /usr/include/ruby-3.2.0, /usr/lib/ruby, /usr/share/doc/ruby-3.2.2 and /usr/share/ri

Short Descriptions


creates bundles of Ruby Gems


manages an application's dependencies throughout it's lifecycle


is a command line front-end for eRuby, which provides a templating system for Ruby


is the command for RubyGems, which is a sophisticated package manager for Ruby. This is similar to Python's 'pip' command


is the interactive interface for Ruby


is a make-like build utility for Ruby


is an interactive debugger for Ruby


generates Ruby documentation


displays documentation from a database on Ruby classes, modules, and methods


is an interpreted scripting language for quick and easy object-oriented programming

contains the API functions required by Ruby