scheme48: refactor and add siraben as maintainer

pkgs/development/interpreters/scheme48/default.nix

@@ -1,17 +1,24 @@
 { lib, stdenv, fetchurl }:
 
-stdenv.mkDerivation {
-  name = "scheme48-1.9.2";
-
-  meta = {
-    homepage = "http://s48.org/";
-    description = "Scheme 48";
-    platforms = with lib.platforms; unix;
-    license = lib.licenses.bsd3;
-  };
+stdenv.mkDerivation rec {
+  pname = "scheme48";
+  version = "1.9.2";
 
   src = fetchurl {
-    url = "http://s48.org/1.9.2/scheme48-1.9.2.tgz";
+    url = "http://s48.org/${version}/scheme48-${version}.tgz";
     sha256 = "1x4xfm3lyz2piqcw1h01vbs1iq89zq7wrsfjgh3fxnlm1slj2jcw";
   };
+
+  # Make more reproducible by removing build user and date.
+  postPatch = ''
+    substituteInPlace build/build-usual-image --replace '"(made by $USER on $date)"' '""'
+  '';
+
+  meta = with lib; {
+    homepage = "http://s48.org/";
+    description = "Scheme 48 interpreter for R5RS";
+    platforms = platforms.unix;
+    license = licenses.bsd3;
+    maintainers = [ maintainers.siraben ];
+  };
 }