Dyson

$ gforth --version
gforth 0.7.3

$ gforth ./gcd.fs 11 22 121
11

$ cat gcd.fs
: gcd ( a b -- d )
  2dup > if swap endif
  over mod
  dup 0 <> if recurse else drop endif
  ;

: gcdn ( a1 a2 .. an n -- d )
  dup 1 >
  if
    1 - rot rot
    gcd
    swap
    recurse
  else
    drop
  endif
  ;

\ This is gforth-specific.
\ Usage:
\ # gforth ./gcd.fs 11 22 33 121
\ 11

: main
  0 >r
  begin
  next-arg 2dup 0 0 d<> while
  s>unumber? if drop else abort endif
  r> 1 + >r
  repeat
  2drop
  r> gcdn . cr
  ;

main bye

$ dpkg -s gforth
Package: gforth
Status: install ok installed
Priority: optional
Section: interpreters
Installed-Size: 481
Maintainer: Peter Pentchev <roam@ringlet.net>
Architecture: illumos-amd64
Multi-Arch: foreign
Version: 0.7.3+dfsg-4+dyson1
Depends: libc1 (>= 5.10.18.git.2a44663-1), libffcall1 (>= 1.10+2.41), libffi6 (>= 3.0.13-4+dyson1), libltdl7 (>= 2.4.6), emacsen-common (>= 2.0.7), gforth-common (= 0.7.3+dfsg-4+dyson1), gforth-lib (= 0.7.3+dfsg-4+dyson1)
Conffiles:
 /etc/emacs/site-start.d/50gforth.el 1629d9314f2e496f2c476df52bf64e80
Description: GNU Forth Language Environment