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+;;; Catbird Game Engine
+;;; Copyright © 2022 David Thompson <davet@gnu.org>
+;;;
+;;; Catbird 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.
+;;;
+;;; Catbird 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 Catbird.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;
+;; Development environment for GNU Guix.
+;;
+;; To setup a development environment and build, run:
+;;
+;;    guix shell
+;;    ./bootstrap
+;;    ./configure
+;;    make -j${nproc}
+;;
+;; To build the development snapshot, run:
+;;
+;;    guix build -f guix.scm
+;;
+;; To install the development snapshot, run:
+;;
+;;    guix install -f guix.scm
+;;
+;;; Code:
+(use-modules (ice-9 match)
+             (srfi srfi-1)
+             (guix build-system gnu)
+             (guix download)
+             (guix gexp)
+             (guix git-download)
+             ((guix licenses) #:prefix license:)
+             (guix packages)
+             (guix utils)
+             (gnu packages)
+             (gnu packages audio)
+             (gnu packages autotools)
+             (gnu packages fontutils)
+             (gnu packages gl)
+             (gnu packages guile)
+             (gnu packages image)
+             (gnu packages maths)
+             (gnu packages mp3)
+             (gnu packages pkg-config)
+             (gnu packages readline)
+             (gnu packages sdl)
+             (gnu packages texinfo)
+             (gnu packages xiph))
+
+(define target-guile guile-3.0-latest)
+
+(define guile3.0-opengl
+  (package
+    (inherit guile-opengl)
+    (inputs
+     (modify-inputs (package-inputs guile-opengl)
+       (replace "guile" target-guile)))
+    (native-inputs
+     (modify-inputs (package-native-inputs guile-opengl)
+       (append autoconf automake)))
+    (arguments
+     (substitute-keyword-arguments (package-arguments guile-opengl)
+       ((#:phases phases)
+        `(modify-phases ,phases
+           (delete 'patch-makefile)
+           (add-before 'bootstrap 'patch-configure.ac
+             (lambda _
+               ;; The Guile version check doesn't work for the 3.0
+               ;; pre-release, so just remove it.
+               (substitute* "configure.ac"
+                 (("GUILE_PKG\\(\\[2.2 2.0\\]\\)") ""))
+               (substitute* "Makefile.am"
+                 (("\\$\\(GUILE_EFFECTIVE_VERSION\\)") "3.0")
+                 (("ccache") "site-ccache"))
+               #t))
+           (replace 'bootstrap
+             (lambda _
+               (invoke "autoreconf" "-vfi")))))))))
+
+(define guile-sdl2
+  (let ((commit "e9a7f5e748719ce5b6ccd08ff91861b578034ea6"))
+    (package
+      (name "guile-sdl2")
+      (version (string-append "0.7.0-1." (string-take commit 7)))
+      (source (origin
+                (method git-fetch)
+                (uri (git-reference
+                      (url "https://git.dthompson.us/guile-sdl2.git")
+                      (commit commit)))
+                (sha256
+                 (base32
+                  "0ay7mcar8zs0j5rihwlzi0l46vgg9i93piip4v8a3dzwjx3myr7v"))))
+      (build-system gnu-build-system)
+      (arguments
+       '(#:make-flags '("GUILE_AUTO_COMPILE=0")
+         #:phases
+         (modify-phases %standard-phases
+           (add-after 'unpack 'bootstrap
+                      (lambda _
+                        (invoke "sh" "bootstrap"))))))
+      (native-inputs (list autoconf automake pkg-config texinfo))
+      (inputs (list target-guile sdl2))
+      (synopsis "Guile bindings for SDL2")
+      (description "Guile-sdl2 provides pure Guile Scheme bindings to the
+SDL2 C shared library via the foreign function interface.")
+      (home-page "https://git.dthompson.us/guile-sdl2.git")
+      (license license:lgpl3+))))
+
+(define chickadee
+  (let ((commit "5edce04c698cd92149004ead1cad77c481c682e8"))
+    (package
+     (name "chickadee")
+     (version (string-append "0.8.0-1." (string-take commit 7)))
+     (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://git.dthompson.us/chickadee.git")
+                    (commit commit)))
+              (sha256
+               (base32
+                "1hckx827aw3af8cbw1mfjy57wdssv1q3bs2hziymxddipwa0d425"))))
+     (build-system gnu-build-system)
+     (arguments
+      '(#:make-flags '("GUILE_AUTO_COMPILE=0")
+        #:phases
+        (modify-phases %standard-phases
+                       (add-after 'unpack 'bootstrap
+                                  (lambda _
+                                    (invoke "sh" "bootstrap"))))))
+     (native-inputs (list autoconf automake pkg-config texinfo))
+     (inputs (list freetype
+                   libjpeg-turbo
+                   libpng
+                   libvorbis
+                   mpg123
+                   openal
+                   readline
+                   target-guile))
+     (propagated-inputs (list guile3.0-opengl guile-sdl2))
+     (synopsis "Game development toolkit for Guile Scheme")
+     (description "Chickadee is a game development toolkit for Guile
+Scheme.  It contains all of the basic components needed to develop
+2D/3D video games.")
+     (home-page "https://dthompson.us/projects/chickadee.html")
+     (license license:gpl3+))))
+
+(define %source-dir (dirname (current-filename)))
+
+(package
+  (name "catbird")
+  (version "0.1")
+  (source (local-file %source-dir
+                      #:recursive? #t
+                      #:select? (git-predicate %source-dir)))
+  (build-system gnu-build-system)
+  (arguments
+   '(#:make-flags '("GUILE_AUTO_COMPILE=0")
+     #:phases
+     (modify-phases %standard-phases
+       (add-after 'unpack 'bootstrap
+         (lambda _
+           (invoke "sh" "bootstrap"))))))
+  (native-inputs (list autoconf automake pkg-config texinfo))
+  (inputs (list target-guile))
+  (propagated-inputs (list chickadee guile-sdl2))
+  (synopsis "Game engine for Scheme programmers")
+  (description "Catbird is a game engine written in Guile Scheme.")
+  (home-page "https://dthompson.us/projects/chickadee.html")
+  (license license:gpl3+))