Chicken: Downgrade to latest stable release & add pkgs.chicken-dev.

Signed-off-by: Moritz Ulrich <[e-mail]>

pkgs/development/compilers/chicken/default.nix

···
-{ stdenv, fetchurl }:
+{ stdenv, fetchurl, devSnapshot ? false }:
 
-stdenv.mkDerivation {
-  name = "chicken-4.8.1";
-
-  meta = {
-    homepage = http://www.call-cc.org/;
-    description = "Chicken Scheme";
+let
+  version = if devSnapshot
+    then "4.8.2"
+    else "4.8.0.5";
+  srcRelease = fetchurl {
+    url = "http://code.call-cc.org/releases/4.8.0/chicken-4.8.0.5.tar.gz";
+    sha256 = "1yrhqirqj3l535zr5mv8d1mz9gq876wwwg4nsjfw27663far54av";
   };
-
-  src = fetchurl {
-    url = http://code.call-cc.org/dev-snapshots/2013/01/04/chicken-4.8.1.tar.gz;
-    md5 = "bd758ec7abeaeb4f4c92c290fb5f3db7";
+  srcDev = fetchurl {
+    url = "http://code.call-cc.org/dev-snapshots/2013/08/08/chicken-4.8.2.tar.gz";
+    sha256 = "01g7h0664342nl536mnri4c72kwj4z40vmv1250xfndlr218qdqg";
   };
+in
+stdenv.mkDerivation {
+  name = "chicken-${version}";
+
+  src = if devSnapshot
+    then srcDev
+    else srcRelease;
 
   buildFlags = "PLATFORM=linux PREFIX=$(out) VARDIR=$(out)/var/lib";
   installFlags = "PLATFORM=linux PREFIX=$(out) VARDIR=$(out)/var/lib";
+
+  meta = {
+    homepage = http://www.call-cc.org/;
+    license = "BSD";
+    maintainers = with stdenv.lib.maintainers; [ the-kenny ];
+    platforms = stdenv.lib.platforms.all;
+    description = "A portable compiler for the Scheme programming language";
+    longDescription = ''
+      CHICKEN is a compiler for the Scheme programming language.
+      CHICKEN produces portable and efficient C, supports almost all
+      of the R5RS Scheme language standard, and includes many
+      enhancements and extensions. CHICKEN runs on Linux, MacOS X,
+      Windows, and many Unix flavours.
+    '';
+  };
 }

pkgs/top-level/all-packages.nix

···
 
   chicken = callPackage ../development/compilers/chicken { };
 
+  chicken-dev = chicken.override {
+    devSnapshot = true;
+  };
+
   ccl = builderDefsPackage ../development/compilers/ccl {};
 
   clangUnwrapped = callPackage ../development/compilers/llvm/clang.nix {