#### Linux From Scratch - Version 7.9

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# v. Rationale for Packages in the Book

As stated earlier, the goal of LFS is to build a complete and usable foundation-level system. This includes all packages needed to replicate itself while providing a relatively minimal base from which to customize a more complete system based on the choices of the user. This does not mean that LFS is the smallest system possible. Several important packages are included that are not strictly required. The lists below document the rationale for each package in the book.

- Acl

  This package contains utilities to administer Access Control Lists, which are used to define more fine-grained discretionary access rights for files and directories.

- Attr

  This package contains programs for administering extended attributes on filesystem objects.

- Autoconf

  This package contains programs for producing shell scripts that can automatically configure source code from a developer's template. It is often needed to rebuild a package after updates to the build procedures.

- Automake

  This package contains programs for generating Make files from a template. It is often needed to rebuild a package after updates to the build procedures.

- Bash

  This package satisfies an LSB core requirement to provide a Bourne Shell interface to the system. It was chosen over other shell packages because of its common usage and extensive capabilities beyond basic shell functions.

- Bc

  This package provides an arbitrary precision numeric processing language. It satisfies a requirement needed when building the Linux kernel.

- Binutils

  This package contains a linker, an assembler, and other tools for handling object files. The programs in this package are needed to compile most of the packages in an LFS system and beyond.

- Bison

  This package contains the GNU version of yacc (Yet Another Compiler Compiler) needed to build several other LFS programs.

- Bzip2

  This package contains programs for compressing and decompressing files. It is required to decompress many LFS packages.

- Check

  This package contains a test harness for other programs. It is only installed in the temporary toolchain.

- Coreutils

  This package contains a number of essential programs for viewing and manipulating files and directories. These programs are needed for command line file management, and are necessary for the installation procedures of every package in LFS.

- DejaGNU

  This package contains a framework for testing other programs. It is only installed in the temporary toolchain.

- Diffutils

  This package contains programs that show the differences between files or directories. These programs can be used to create patches, and are also used in many packages' build procedures.

- E2fsprogs

  This package contains the utilities for handling the ext2, ext3 and ext4 file systems. These are the most common and thoroughly tested file systems that Linux supports.

- Eudev

  This package is a device manager. It dynamically controls the entries in the /dev directory as devices are added or removed from the system.

- Expat

  This package contains a relatively small XML parsing library. It is required by the XML::Parser Perl module.

- Expect

  This package contains a program for carrying out scripted dialogues with other interactive programs. It is commonly used for testing other packages. It is only installed in the temporary toolchain.

- File

  This package contains a utility for determining the type of a given file or files. A few packages need it to build.

- Findutils

  This package contains programs to find files in a file system. It is used in many packages' build scripts.

- Flex

  This package contains a utility for generating programs that recognize patterns in text. It is the GNU version of the lex (lexical analyzer) program. It is required to build several LFS packages.

- Gawk

  This package contains programs for manipulating text files. It is the GNU version of awk (Aho-Weinberg-Kernighan). It is used in many other packages' build scripts.

- Gcc

  This package is the Gnu Compiler Collection. It contains the C and C++ compilers as well as several others not built by LFS.

- GDBM

  This package contains the GNU Database Manager library. It is used by one other LFS package, Man-DB.

- Gettext

  This package contains utilities and libraries for internationalization and localization of numerous packages.

- Glibc

  This package contains the main C library. Linux programs would not run without it.

- GMP

  This package contains math libraries that provide useful functions for arbitrary precision arithmetic. It is required to build Gcc.

- Gperf

  This package contains a program that generates a perfect hash function from a key set. It is required for Eudev.

- Grep

  This package contains programs for searching through files. These programs are used by most packages' build scripts.

- Groff

  This package contains programs for processing and formatting text. One important function of these programs is to format man pages.

- GRUB

  This package is the Grand Unified Boot Loader. It is one of several boot loaders available, but is the most flexible.

- Gzip

  This package contains programs for compressing and decompressing files. It is needed to decompress many packages in LFS and beyond.

- Iana-etc

  This package provides data for network services and protocols. It is needed to enable proper networking capabilities.

- Inetutils

  This package contains programs for basic network administration.

- Intltool

  This package contains tools for extracting translatable strings from source files.

- IProute2

  This package contains programs for basic and advanced IPv4 and IPv6 networking. It was chosen over the other common network tools package (net-tools) for its IPv6 capabilities.

- Kbd

  This package contains key-table files, keyboard utilities for non-US keyboards, and a number of console fonts.

- Kmod

  This package contains programs needed to administer Linux kernel modules.

- Less

  This package contains a very nice text file viewer that allows scrolling up or down when viewing a file. It is also used by Man-DB for viewing manpages.

- Libcap

  This package implements the user-space interfaces to the POSIX 1003.1e capabilities available in Linux kernels.

- Libpipeline

  The Libpipeline package contains a library for manipulating pipelines of subprocesses in a flexible and convenient way. It is required by the Man-DB package.

- Libtool

  This package contains the GNU generic library support script. It wraps the complexity of using shared libraries in a consistent, portable interface. It is needed by the test suites in other LFS packages.

- Linux Kernel

  This package is the Operating System. It is the Linux in the GNU/Linux environment.

- M4

  This package contains a general text macro processor useful as a build tool for other programs.

- Make

  This package contains a program for directing the building of packages. It is required by almost every package in LFS.

- Man-DB

  This package contains programs for finding and viewing man pages. It was chosen instead of the man package due to superior internationalization capabilities. It supplies the man program.

- Man-pages

  This package contains the actual contents of the basic Linux man pages.

- MPC

  This package contains functions for the arithmetic of complex numbers. It is required by Gcc.

- MPFR

  This package contains functions for multiple precision arithmetic. It is required by Gcc.

- Ncurses

  This package contains libraries for terminal-independent handling of character screens. It is often used to provide cursor control for a menuing system. It is needed by a number of packages in LFS.

- Patch

  This package contains a program for modifying or creating files by applying a patch file typically created by the diff program. It is needed by the build procedure for several LFS packages.

- Perl

  This package is an interpreter for the runtime language PERL. It is needed for the installation and test suites of several LFS packages.

- Pkg-config

  This package provides a program to return meta-data about an installed library or package.

- Procps-NG

  This package contains programs for monitoring processes. These programs are useful for system administration, and are also used by the LFS Bootscripts.

- Psmisc

  This package contains programs for displaying information about running processes. These programs are useful for system administration.

- Readline

  This package is a set of libraries that offers command-line editing and history capabilities. It is used by Bash.

- Sed

  This package allows editing of text without opening it in a text editor. It is also needed by most LFS packages' configure scripts.

- Shadow

  This package contains programs for handling passwords in a secure way.

- Sysklogd

  This package contains programs for logging system messages, such as those given by the kernel or daemon processes when unusual events occur.

- Sysvinit

  This package provides the init program, which is the parent of all other processes on the Linux system.

- Tar

  This package provides archiving and extraction capabilities of virtually all packages used in LFS.

- Tcl

  This package contains the Tool Command Language used in many test suites in LFS packages. It is only installed in the temporary toolchain.

- Texinfo

  This package contains programs for reading, writing, and converting info pages. It is used in the installation procedures of many LFS packages.

- Util-linux

  This package contains miscellaneous utility programs. Among them are utilities for handling file systems, consoles, partitions, and messages.

- Vim

  This package contains an editor. It was chosen because of its compatibility with the classic vi editor and its huge number of powerful capabilities. An editor is a very personal choice for many users and any other editor could be substituted if desired.

- XML::Parser

  This package is a Perl module that interfaces with Expat.

- XZ Utils

  This package contains programs for compressing and decompressing files. It provides the highest compression generally available and is useful for decompressing packages in XZ or LZMA format.

- Zlib

  This package contains compression and decompression routines used by some programs.

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