path: root/gnu/packages/sdl.scm

;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2015, 2017 David Thompson <dthompson2@worcester.edu>
;;; Copyright © 2014 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2015, 2017 Sou Bunnbu <iyzsong@member.fsf.org>
;;; Copyright © 2015 Alex Kost <alezost@gmail.com>
;;; Copyright © 2016, 2017 Efraim Flashner <efraim@flashner.co.il>
;;; Copyright © 2017, 2018, 2019 Rutger Helling <rhelling@mykolab.com>
;;; Copyright © 2018, 2019 Tobias Geerinckx-Rice <me@tobias.gr>
;;; Copyright © 2018, 2019 Ricardo Wurmus <rekado@elephly.net>
;;; Copyright © 2019 Kei Kebreau <kkebreau@posteo.net>
;;; Copyright © 2019 Nicolas Goaziou <mail@nicolasgoaziou.fr>
;;; Copyright © 2019 Marius Bakke <mbakke@fastmail.com>
;;; Copyright © 2019 Pierre Neidhardt <mail@ambrevar.xyz>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu packages sdl)
  #:use-module (ice-9 match)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-26)
  #:use-module (gnu packages)
  #:use-module ((guix licenses) #:hide (freetype))
  #:use-module (guix packages)
  #:use-module (guix download)
  #:use-module (guix git-download)
  #:use-module (guix utils)
  #:use-module (guix build-system gnu)
  #:use-module (guix build-system trivial)
  #:use-module (gnu packages audio)
  #:use-module (gnu packages fcitx)
  #:use-module (gnu packages fontutils)
  #:use-module (gnu packages freedesktop)
  #:use-module (gnu packages glib)
  #:use-module (gnu packages guile)
  #:use-module (gnu packages ibus)
  #:use-module (gnu packages image)
  #:use-module (gnu packages linux)
  #:use-module (gnu packages mono)
  #:use-module (gnu packages mp3)
  #:use-module (gnu packages pkg-config)
  #:use-module (gnu packages pulseaudio)
  #:use-module (gnu packages gl)
  #:use-module (gnu packages xdisorg)
  #:use-module (gnu packages xiph)
  #:use-module (gnu packages xorg)
  #:export (sdl-union))

(define-public sdl
  (package
    (name "sdl")
    (version "1.2.15")
    (source (origin
             (method url-fetch)
             (uri
              (string-append "https://libsdl.org/release/SDL-"
                             version ".tar.gz"))
             (sha256
              (base32
               "005d993xcac8236fpvd1iawkz4wqjybkpn8dbwaliqz5jfkidlyn"))
             (patches (search-patches "sdl-libx11-1.6.patch"))))
    (build-system gnu-build-system)
    (arguments
     '(;; Explicitly link against shared libraries instead of dlopening them.
       ;; For X11, ALSA, and PulseAudio.
       ;; OpenGL library is still dlopened at runtime.
       #:configure-flags '("--disable-alsa-shared"
                           "--disable-pulseaudio-shared"
                           "--disable-x11-shared"
                           ;; Explicitly link with mesa.
                           ;; This add mesa to libsdl's RUNPATH, to make dlopen
                           ;; finding the libGL from mesa at runtime.
                           "LDFLAGS=-lGL")

       #:make-flags '("V=1")            ;build verbosely

       #:tests? #f)) ; no check target
    (propagated-inputs
     ;; SDL headers include X11 headers.
     `(("libx11" ,libx11)
       ("libcap" ,libcap) ; 'libSDL.la' contain `-lcap'.
       ;; TODO: Since building Mesa with Meson it is now necessary that Mesa is
       ;; a propogated input. We still need to figure out why, possibly due to a
       ;; change in pkg-config.
       ("mesa" ,mesa)))
    (native-inputs `(("pkg-config" ,pkg-config)))
    (inputs `(("libxrandr" ,libxrandr)
              ("glu" ,glu)
              ("alsa-lib" ,alsa-lib)
              ("pulseaudio" ,pulseaudio)))
    (outputs '("out" "debug"))
    (synopsis "Cross platform game development library")
    (description "Simple DirectMedia Layer is a cross-platform development
library designed to provide low level access to audio, keyboard, mouse,
joystick, and graphics hardware.")
    (home-page "https://libsdl.org/")
    (license lgpl2.1)))

(define-public sdl2
  (package (inherit sdl)
    (name "sdl2")
    (version "2.0.10")
    (source (origin
             (method url-fetch)
             (uri
              (string-append "https://libsdl.org/release/SDL2-"
                             version ".tar.gz"))
             (patches (search-patches "sdl2-mesa-compat.patch"))
             (sha256
              (base32
               "0mqxp6w5jhbq6y1j690g9r3gpzwjxh4czaglw8x05l7hl49nqrdl"))))
    (arguments
     (substitute-keyword-arguments (package-arguments sdl)
       ((#:configure-flags flags)
        `(append '("--disable-wayland-shared" "--enable-video-kmsdrm"
                   "--disable-kmsdrm-shared")
                 ,flags))
       ((#:make-flags flags ''())
        ;; Add the Fcitx header files to GCCs "system header" search path
        ;; in order to suppress compiler warnings induced by those:
        ;;   .../include/fcitx-utils/utarray.h:178:9: error: ISO C90 forbids
        ;;   mixed declarations and code [-Werror=declaration-after-statement]
        `(append (list (string-append "C_INCLUDE_PATH="
                                      (assoc-ref %build-inputs "fcitx")
                                      "/include"))
                 ,flags))))
    (inputs
     ;; SDL2 needs to be built with ibus support otherwise some systems
     ;; experience a bug where input events are doubled.
     ;;
     ;; For more information, see: https://dev.solus-project.com/T1721
     (append `(("dbus" ,dbus)
               ("fcitx" ,fcitx) ; helps with CJK input
               ("glib" ,glib)
               ("ibus" ,ibus)
               ("libxkbcommon" ,libxkbcommon)
               ("libxcursor" ,libxcursor) ; enables X11 cursor support
               ("wayland" ,wayland)
               ("wayland-protocols" ,wayland-protocols))
             (package-inputs sdl)))
    (license bsd-3)))

(define-public libmikmod
  (package
    (name "libmikmod")
    (version "3.3.11.1")
    (source (origin
             (method url-fetch)
             (uri (list
                   (string-append "mirror://sourceforge/mikmod/libmikmod/"
                                  version "/libmikmod-" version ".tar.gz")
                   ;; Older versions are sometimes moved to:
                   (string-append "mirror://sourceforge/mikmod/"
                                  "outdated_versions/libmikmod/"
                                  version "/libmikmod-" version ".tar.gz")))
             (sha256
              (base32
               "06bdnhb0l81srdzg6gn2v2ydhhaazza7rshrcj3q8dpqr3gn97dd"))))
    (build-system gnu-build-system)
    (arguments
     ;; By default, libmikmod tries to dlopen libasound etc., which won't work
     ;; unless the right libalsa happens to be in $LD_LIBRARY_PATH.  Pass
     ;; '--disable-dl' to avoid that.
     '(#:configure-flags '("--disable-dl")))
    (synopsis "Library for module sound formats")
    (description
     "MikMod is able to play a wide range of module formats, as well as
digital sound files.  It can take advantage of particular features of your
system, such as sound redirection over the network.")
    (license lgpl2.1)
    (home-page "http://mikmod.sourceforge.net/")))

(define-public sdl-gfx
  (package
    (name "sdl-gfx")
    (version "2.0.26")
    (source (origin
              (method url-fetch)
              (uri
               (string-append "http://www.ferzkopp.net/Software/SDL_gfx-2.0/SDL_gfx-"
                              version ".tar.gz"))
              (sha256
               (base32
                "0ijljhs0v99dj6y27hc10z6qchyp8gdp4199y6jzngy6dzxlzsvw"))))
    (build-system gnu-build-system)
    (outputs '("out" "debug"))
    (arguments
     `(,@(if (any (cute string-prefix? <> (or (%current-system)
                                              (%current-target-system)))
                  '("x86_64" "i686"))
        ;; mmx is supported only on Intel processors.
        '()
        '(#:configure-flags '("--disable-mmx")))))
    (propagated-inputs `(("sdl" ,sdl)))
    (synopsis "SDL graphics primitives library")
    (description "SDL_gfx provides graphics drawing primitives, rotozoom and
other supporting functions for SDL.")
    (home-page "http://www.ferzkopp.net/joomla/software-mainmenu-14/4-ferzkopps-linux-software/19-sdlgfx")
    (license zlib)))

(define-public sdl-image
  (package
    (name "sdl-image")
    (version "1.2.12")
    (source (origin
             (method url-fetch)
             (uri
              (string-append "https://www.libsdl.org/projects/SDL_image/release/SDL_image-"
                             version ".tar.gz"))
             (sha256
              (base32
               "16an9slbb8ci7d89wakkmyfvp7c0cval8xw4hkg0842nhhlp540b"))))
    (build-system gnu-build-system)
    (outputs '("out" "debug"))
    (arguments
     ;; Explicitly link against shared libraries instead of dlopening them.
     '(#:configure-flags '("--disable-jpg-shared"
                           "--disable-png-shared"
                           "--disable-tif-shared"
                           "--disable-webp-shared")))
    (native-inputs `(("pkg-config" ,pkg-config)))
    ;; libjpeg, libpng, and libtiff are propagated inputs because the
    ;; SDL_image headers include the headers of these libraries.  SDL is a
    ;; propagated input because the pkg-config file refers to SDL's pkg-config
    ;; file.
    (propagated-inputs `(("sdl" ,sdl)
                         ("libjpeg" ,libjpeg)
                         ("libpng" ,libpng)
                         ("libtiff" ,libtiff)
                         ("libwebp" ,libwebp)))
    (synopsis "SDL image loading library")
    (description "SDL_image is an image file loading library for SDL that
supports the following formats: BMP, GIF, JPEG, LBM, PCX, PNG, PNM, TGA, TIFF,
WEBP, XCF, XPM, and XV.")
    (home-page "https://www.libsdl.org/projects/SDL_image/")
    (license zlib)))

(define-public sdl-mixer
  (package
    (name "sdl-mixer")
    (version "1.2.12")
    (source (origin
              (method url-fetch)
              (uri
               (string-append "https://www.libsdl.org/projects/SDL_mixer/release/SDL_mixer-"
                              version ".tar.gz"))
              (sha256
               (base32
                "0alrhqgm40p4c92s26mimg9cm1y7rzr6m0p49687jxd9g6130i0n"))))
    (build-system gnu-build-system)
    (outputs '("out" "debug"))
    ;; no check target
    ;; use libmad instead of smpeg
    ;; explicitly link against shared libraries instead of dlopening them
    (arguments `(#:tests? #f
                 #:configure-flags '("--enable-music-mp3-mad-gpl"
                                     "--disable-music-mod-shared"
                                     "--disable-music-fluidsynth-shared"
                                     "--disable-music-ogg-shared"
                                     "--disable-music-flac-shared"
                                     "--disable-music-mp3-shared")))
    (inputs `(("libvorbis" ,libvorbis)
              ("libflac" ,flac)
              ("libmad" ,libmad)
              ("libmikmod" ,libmikmod)
              ("libmodplug" ,libmodplug)))
    ;; FIXME: Add libfluidsynth
    (propagated-inputs `(("sdl" ,sdl)))
    (synopsis "SDL multi-channel audio mixer library")
    (description "SDL_mixer is a multi-channel audio mixer library for SDL.
It supports any number of simultaneously playing channels of 16 bit stereo
audio, plus a single channel of music.  Supported format include FLAC, MOD,
MIDI, Ogg Vorbis, and MP3.")
    (home-page "https://www.libsdl.org/projects/SDL_mixer/")
    (license zlib)))

(define-public sdl-net
  (package
    (name "sdl-net")
    (version "1.2.8")
    (source (origin
              (method url-fetch)
              (uri
               (string-append "https://www.libsdl.org/projects/SDL_net/release/SDL_net-"
                              version ".tar.gz"))
              (sha256
               (base32
                "1d5c9xqlf4s1c01gzv6cxmg0r621pq9kfgxcg3197xw4p25pljjz"))))
    (build-system gnu-build-system)
    (propagated-inputs `(("sdl" ,sdl)))
    (native-inputs `(("pkg-config" ,pkg-config)))
    (outputs '("out" "debug"))
    (synopsis "SDL networking library")
    (description "SDL_net is a small, cross-platform networking library for
SDL.")
    (home-page "https://www.libsdl.org/projects/SDL_net/")
    (license zlib)))

(define-public sdl-ttf
  (package
    (name "sdl-ttf")
    (version "2.0.11")
    (source (origin
             (method url-fetch)
             (uri
              (string-append "https://www.libsdl.org/projects/SDL_ttf/release/SDL_ttf-"
                             version ".tar.gz"))
             (sha256
              (base32
               "1dydxd4f5kb1288i5n5568kdk2q7f8mqjr7i7sd33nplxjaxhk3j"))))
    (build-system gnu-build-system)
    (propagated-inputs `(("sdl" ,sdl)))
    (inputs `(("freetype" ,freetype)
              ("mesa" ,mesa)))
    (native-inputs `(("pkg-config" ,pkg-config)))
    (outputs '("out" "debug"))
    (synopsis "SDL TrueType font library")
    (description "SDL_ttf is a TrueType font rendering library for SDL.")
    (home-page "https://www.libsdl.org/projects/SDL_ttf/")
    (license zlib)))

(define* (sdl-union #:optional (packages (list sdl sdl-gfx sdl-net sdl-ttf
                                               sdl-image sdl-mixer)))
  "Return 'sdl-union' package which is a union of PACKAGES.
If PACKAGES are not specified, all SDL packages are used."
  (package
    (name "sdl-union")
    (version (package-version sdl))
    (source #f)
    (build-system trivial-build-system)
    (arguments
     '(#:modules ((guix build union))
       #:builder (begin
                   (use-modules (ice-9 match)
                                (guix build union))
                   (match %build-inputs
                     (((names . directories) ...)
                      (union-build (assoc-ref %outputs "out")
                                   directories)
                      #t)))))
    (inputs (map (lambda (package)
                   (list (package-name package) package))
                 packages))
    (synopsis "Union of SDL libraries")
    (description
     "A union of SDL and its extension libraries.  A union is required because
sdl-config assumes that all of the headers and libraries are in the same
directory.")
    (home-page (package-home-page sdl))
    (license (package-license sdl))))

(define (propagated-inputs-with-sdl2 package)
  "Replace the \"sdl\" propagated input of PACKAGE with SDL2."
  (map (match-lambda
         (("sdl" _)
          `("sdl2" ,sdl2))
         (other other))
       (package-propagated-inputs package)))

(define-public sdl2-gfx
  (package (inherit sdl-gfx)
    (name "sdl2-gfx")
    (version "1.0.4")
    (source (origin
              (method url-fetch)
              (uri
               (string-append "https://www.ferzkopp.net/Software/SDL2_gfx/SDL2_gfx-"
                              version ".tar.gz"))
              (sha256
               (base32
                "0qk2ax7f7grlxb13ba0ll3zlm8780s7j8fmrhlpxzjgdvldf1q33"))))
    (propagated-inputs
     (propagated-inputs-with-sdl2 sdl-gfx))))

(define-public sdl2-image
  (package (inherit sdl-image)
    (name "sdl2-image")
    (version "2.0.4")
    (source
     (origin
       (method url-fetch)
       (uri
        (string-append "https://www.libsdl.org/projects/SDL_image/release/"
                       "SDL2_image-" version ".tar.gz"))
       (sha256
        (base32 "1b6f7002bm007y3zpyxb5r6ag0lml51jyvx1pwpj9sq24jfc8kp7"))))
    (propagated-inputs
     (propagated-inputs-with-sdl2 sdl-image))))

(define-public sdl2-mixer
  (package (inherit sdl-mixer)
    (name "sdl2-mixer")
    (version "2.0.4")
    (source
     (origin
       (method url-fetch)
       (uri
        (string-append "http://www.libsdl.org/projects/SDL_mixer/release/"
                       "SDL2_mixer-" version ".tar.gz"))
       (modules '((guix build utils)))
       (snippet '(begin
                   ;; Remove bundled libraries.
                   (delete-file-recursively "external")
                   #t))
       (sha256
        (base32 "0694vsz5bjkcdgfdra6x9fq8vpzrl8m6q96gh58df7065hw5mkxl"))))
    (propagated-inputs
     (propagated-inputs-with-sdl2 sdl-mixer))))

(define-public sdl2-net
  (package (inherit sdl-net)
    (name "sdl2-net")
    (version "2.0.1")
    (source
     (origin
       (method url-fetch)
       (uri
        (string-append "http://www.libsdl.org/projects/SDL_net/release/"
                       "SDL2_net-" version ".tar.gz"))
       (sha256
        (base32
         "08cxc1bicmyk89kiks7izw1rlx5ng5n6xpy8fy0zxni3b9z8mkhm"))))
    (propagated-inputs
     (propagated-inputs-with-sdl2 sdl-net))))

(define-public sdl2-ttf
  (package (inherit sdl-ttf)
    (name "sdl2-ttf")
    (version "2.0.15")
    (source (origin
             (method url-fetch)
             (uri
              (string-append "https://www.libsdl.org/projects/SDL_ttf/release/SDL2_ttf-"
                             version ".tar.gz"))
             (modules '((guix build utils)))
             (snippet (begin
                        ;; Remove bundled libraries.
                        '(delete-file-recursively "external")
                        #t))
             (sha256
              (base32
               "0cyd48dipc0m399qy8s03lci8b0bpiy8xlkvrm2ia7wcv0dfpv59"))))
    (propagated-inputs
     (propagated-inputs-with-sdl2 sdl-ttf))))

(define-public guile-sdl
  (package
    (name "guile-sdl")
    (version "0.5.2")
    (source (origin
              (method url-fetch)
              (uri
               (string-append "mirror://gnu/guile-sdl/guile-sdl-"
                              version ".tar.xz"))
              (sha256
               (base32
                "0cjgs012a9922hn6xqwj66w6qmfs3nycnm56hyykx5n3g5p7ag01"))))
    (build-system gnu-build-system)
    (native-inputs
     `(("pkg-config" ,pkg-config)
       ;; Required by test suite.
       ("xorg-server" ,xorg-server)
       ("libjpeg" ,libjpeg)))
    (inputs
     `(("guile" ,guile-2.2)
       ("sdl-union" ,(sdl-union))))
    (arguments
     '(#:configure-flags
       (list (string-append "--with-sdl-prefix="
                            (assoc-ref %build-inputs "sdl-union")))
       #:modules ((ice-9 popen)
                  (guix build utils)
                  (guix build gnu-build-system))

       #:parallel-build? #f ; parallel build fails

       #:phases
       (modify-phases %standard-phases
         (add-before 'configure 'fix-env-and-patch
           (lambda* (#:key inputs #:allow-other-keys)
             (setenv "GUILE_AUTO_COMPILE" "0")
             ;; SDL_image needs to dlopen libjpeg in the test suite.
             (setenv "LD_LIBRARY_PATH"
                     (string-append (assoc-ref inputs "libjpeg") "/lib"))

             ;; Change the site directory /site/X.Y like Guile expects.
             (substitute* "build-aux/guile-baux/re-prefixed-site-dirs"
               (("\"/site\"")
                (let ((effective
                       (read
                        (open-pipe* OPEN_READ
                                    "guile" "-c"
                                    "(write (effective-version))"))))
                  (string-append "\"/site/" effective "\""))))

             ;; Skip tests that rely on sound support, which is unavailable in
             ;; the build environment.
             (substitute* "test/Makefile.in"
               (("HAVE_MIXER = .*$")
                "HAVE_MIXER = 0\n"))
             #t))
         (add-before 'check 'start-xorg-server
           (lambda* (#:key inputs #:allow-other-keys)
             ;; The test suite requires a running X server.
             (system (format #f "~a/bin/Xvfb :1 &"
                             (assoc-ref inputs "xorg-server")))
             (setenv "DISPLAY" ":1")
             #t))
         (add-before 'check 'skip-cursor-test
           (lambda _
             ;; XXX: This test sometimes enters an endless loop, and sometimes
             ;; crashes with:
             ;;   guile: xcb_io.c:147: append_pending_request: Assertion `!xcb_xlib_unknown_seq_number' failed.
             ;; Skip it.
             (substitute* "test/cursor.scm"
               (("\\(SDL:init .*" all)
                (string-append "(exit 77)  ;" all "\n")))
             #t)))))
    (synopsis "Guile interface for SDL (Simple DirectMedia Layer)")
    (description "Guile-SDL is a set of bindings to the Simple DirectMedia
Layer (SDL).  With them, Guile programmers can have easy access to graphics,
sound and device input (keyboards, joysticks, mice, etc.).")
    (home-page "https://www.gnu.org/software/guile-sdl/")
    (license gpl3+)))

(define-public guile-sdl2
  (package
    (name "guile-sdl2")
    (version "0.4.0")
    (source (origin
              (method url-fetch)
              (uri (string-append "https://files.dthompson.us/guile-sdl2/"
                                  "guile-sdl2-" version ".tar.gz"))
              (sha256
               (base32
                "0zcxwgyadwpbhq6h5mv2569c3kalgra26zc186y9fqiyyzmh1v9s"))))
    (build-system gnu-build-system)
    (arguments
     '(#:make-flags '("GUILE_AUTO_COMPILE=0")
       #:configure-flags
       (list (string-append "--with-libsdl2-prefix="
                            (assoc-ref %build-inputs "sdl2"))
             (string-append "--with-libsdl2-image-prefix="
                            (assoc-ref %build-inputs "sdl2-image"))
             (string-append "--with-libsdl2-ttf-prefix="
                            (assoc-ref %build-inputs "sdl2-ttf"))
             (string-append "--with-libsdl2-mixer-prefix="
                            (assoc-ref %build-inputs "sdl2-mixer")))))
    (native-inputs
     `(("guile" ,guile-2.2)
       ("pkg-config" ,pkg-config)))
    (inputs
     `(("sdl2" ,sdl2)
       ("sdl2-image" ,sdl2-image)
       ("sdl2-mixer" ,sdl2-mixer)
       ("sdl2-ttf" ,sdl2-ttf)))
    (synopsis "Guile bindings for SDL2")
    (home-page "https://dthompson.us/projects/guile-sdl2.html")
    (description
     "Guile-SDL2 provides Guile Scheme bindings for the SDL2 C shared library.
The bindings are written in pure Scheme using Guile's foreign function
interface.")
    (license lgpl3+)))

(define-public sdl2-cs
  (let ((commit "1a3556441e1394eb0b5d46aeb514b8d1090b93f8"))
    (package
      (name "sdl2-cs")
      (version (git-version "B1" "1" commit))
      (source (origin
                (method git-fetch)
                (uri (git-reference
                      (url "https://github.com/flibitijibibo/SDL2-CS")
                      (commit commit)))
                (file-name (git-file-name name version))
                (sha256
                 (base32
                  "007mzkqr9nmvfrvvhs2r6cm36lzgsww24kwshsz9c4fd97f9qk58"))))
      (build-system gnu-build-system)
      (arguments
       '(#:tests? #f  ; No tests.
         #:phases
         (modify-phases %standard-phases
           (delete 'configure)
           (replace 'build
             (lambda _
               (invoke "make" "release")))
           (replace 'install
             (lambda* (#:key outputs #:allow-other-keys)
               (let ((out (assoc-ref outputs "out")))
                 (install-file "bin/Release/SDL2-CS.dll" (string-append out "/lib"))
                 #t))))))
      (native-inputs
       `(("mono" ,mono)))
      (inputs
       `(("sdl2" ,sdl2)
         ("sdl2-image" ,sdl2-image)
         ("sdl2-mixer" ,sdl2-mixer)
         ("sdl2-ttf" ,sdl2-ttf)))
      (home-page "https://dthompson.us/projects/guile-sdl2.html")
      (synopsis "C# wrapper for SDL2")
      (description
       "SDL2-CS provides C# bindings for the SDL2 C shared library.
The C# wrapper was written to be used for FNA's platform support.  However, this
is written in a way that can be used for any general C# application.")
      (license zlib))))