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 dependencies have been updated since the most recent stable versions of the book.

Package Information

  • Download (HTTP):

  • Download MD5 sum: 169bbbd82b7ced3d39a4be36f50db459

  • Download size: 14 MB

  • Estimated disk space required: 574 MB (add 547 MB for C API docs)

  • Estimated build time: 1.3 SBU (using parallelism=4; add 5.0 SBU for tests; add 0.5 SBU for C API docs)

Ruby Dependencies




Berkeley DB-5.3.28, Doxygen-1.9.6, Graphviz-7.1.0, Tk-8.6.13, Valgrind-3.20.0, and DTrace

User Notes:

Installation of Ruby

Install Ruby by running the following command:

./configure --prefix=/usr   \
            --enable-shared \
            --docdir=/usr/share/doc/ruby-3.2.0 &&

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

make capi

To test the results, issue: make 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.

Now, as the root user:

make install


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.

--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.

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


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-3.2.0 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