The following packages should be installed before GNU clisp is installed
(runtime dependencies that are also build dependencies):

* GNU libsigsegv
  + Highly recommended.
    Needed for catching stack overflows (otherwise a stack overflow may crash
    the process) and for generational garbage collection.
  + Homepage:
    https://www.gnu.org/software/libsigsegv/
  + Download:
    https://ftp.gnu.org/gnu/libsigsegv/
  + Pre-built package name:
    - On Debian and Debian-based systems: libsigsegv-dev,
    - On Red Hat distributions: libsigsegv-devel.
    - Other: https://repology.org/project/libsigsegv/versions
  + If it is installed in a nonstandard directory, pass the option
    --with-libsigsegv-prefix=DIR to 'configure'.

* GNU libffcall
  + Highly recommended.
    Needed for the foreign function interface (FFI).
  + Homepage:
    https://www.gnu.org/software/libffcall/
  + Download:
    https://ftp.gnu.org/gnu/libffcall/
  + Pre-built package name:
    - On Debian and Debian-based systems: libffcall-dev,
    - On Red Hat distributions: ffcall.
    - Other: https://repology.org/project/ffcall/versions
  + If it is installed in a nonstandard directory, pass the option
    --with-libffcall-prefix=DIR to 'configure'.

* GNU libiconv
  + Not needed on systems with glibc, on macOS, and NetBSD.
    But recommended on all other systems.
    Needed for multibyte character set support (other than UTF-8,
    for which GNU libiconv is not needed).
  + Homepage:
    https://www.gnu.org/software/libiconv/
  + Download:
    https://ftp.gnu.org/gnu/libiconv/
  + Pre-built package name:
    - On Debian and Debian-based systems: --,
    - On Red Hat distributions: --.
    - Other: https://repology.org/project/libiconv/versions
  + If it is installed in a nonstandard directory, pass the option
    --with-libiconv-prefix=DIR to 'configure'.

* GNU libunistring
  + If not pre-installed, some code will be statically linked into CLISP.
  + Homepage:
    https://www.gnu.org/software/libunistring/
  + Download:
    https://ftp.gnu.org/gnu/libunistring/
  + Pre-built package name:
    - On Debian and Debian-based systems: libunistring-dev,
    - On Red Hat distributions: libunistring-devel.
    - Other: https://repology.org/project/libunistring/versions
  + If it is installed in a nonstandard directory, pass the option
    --with-libunistring-prefix=DIR to 'configure'.  

* libintl, part of GNU gettext
  + Not needed on systems with glibc.
    But recommended on all other systems.
    Needed for localization of messages.
  + Homepage:
    https://www.gnu.org/software/gettext/
  + Download:
    https://ftp.gnu.org/gnu/gettext/
  + Pre-built package name:
    - On Debian and Debian-based systems: --,
    - On Red Hat distributions: --.
    - Other: https://repology.org/project/gettext/versions
  + If it is installed in a nonstandard directory, pass the option
    --with-libintl-prefix=DIR to 'configure'.

* GNU readline
  + Recommended.
    Needed for the interactive line-editing in the read-eval-print loop.
  + Homepage:
    https://www.gnu.org/software/readline/
  + Download:
    https://ftp.gnu.org/gnu/readline/
  + Pre-built package name:
    - On Debian and Debian-based systems: libreadline-dev,
    - On Red Hat distributions: readline-devel.
    - Other: https://repology.org/project/readline/versions
  + If it is installed in a nonstandard directory, pass the option
    --with-libreadline-prefix=DIR to 'configure'.

* GNU ncurses (preferred)
  or libtermcap (discouraged) or a curses library (legacy).
  + Recommended.
    Needed for fancy input/output in terminal emulators.
  + Homepage:
    https://www.gnu.org/software/ncurses/
  + Download:
    https://ftp.gnu.org/gnu/ncurses/
  + Pre-built package name:
    - On Debian and Debian-based systems: libncurses-dev,
    - On Red Hat distributions: ncurses-devel.
    - Other: https://repology.org/project/ncurses/versions
  + If it is installed in a nonstandard directory, pass the option
    --with-libtermcap-prefix to 'configure'.


The following packages should be installed when GNU clisp is installed
(runtime dependencies, but not build dependencies):

None.


The following should be installed when GNU clisp is built, but are not
needed later, once it is installed (build dependencies, but not runtime
dependencies):

* A C runtime, compiler, linker, etc.
  + Mandatory.
    Either the platform's native 'cc', or GCC 3.1 or newer.
  + GCC Homepage:
    https://gcc.gnu.org/
  + Download:
    https://ftp.gnu.org/gnu/gcc/

* A 'make' utility.
  + Mandatory.
    Either the platform's native 'make' (for in-tree builds only),
    or GNU Make 3.79.1 or newer.
  + GNU Make Homepage:
    https://www.gnu.org/software/make/
  + Download:
    https://ftp.gnu.org/gnu/make/

* A shell
  + Mandatory.
    Either the platform's native 'sh', or Bash.
  + Homepage:
    https://www.gnu.org/software/bash/
  + Download:
    https://ftp.gnu.org/gnu/bash/

* Core POSIX utilities, including:
    [ basename cat chgrp chmod chown cp dd echo expand expr
    false hostname install kill ln ls md5sum mkdir mkfifo
    mknod mv printenv pwd rm rmdir sleep sort tee test touch
    true uname
  + Mandatory.
    Either the platform's native utilities, or GNU coreutils.
  + Homepage:
    https://www.gnu.org/software/coreutils/
  + Download:
    https://ftp.gnu.org/gnu/coreutils/

* The comparison utilities 'cmp' and 'diff'.
  + Mandatory.
    Either the platform's native utilities, or GNU diffutils.
  + Homepage:
    https://www.gnu.org/software/diffutils/
  + Download:
    https://ftp.gnu.org/gnu/diffutils/

* Grep.
  + Mandatory.
    Either the platform's native grep, or GNU grep.
  + Homepage:
    https://www.gnu.org/software/grep/
  + Download:
    https://ftp.gnu.org/gnu/grep/

* Awk.
  + Mandatory.
    Either the platform's native awk, mawk, or nawk, or GNU awk.
  + Homepage:
    https://www.gnu.org/software/gawk/
  + Download:
    https://ftp.gnu.org/gnu/gawk/
