libx86: reimplement using mkDerivation

pkgs/development/libraries/libx86/default.nix

···
-a :  
-let 
-  s = import ./src-for-default.nix;
-  buildInputs = with a; [
-    
-  ];
-in
-rec {
-  src = a.fetchUrlFromSrcInfo s;
+{ stdenv, fetchurl }:
 
-  inherit (s) name;
-  inherit buildInputs;
-
-  phaseNames = ["doPatch" "fixX86Def" "killUsr" "doMakeInstall"];
-  patches = [./constants.patch ./non-x86.patch];
+stdenv.mkDerivation rec {
+  name = "libx86-${version}";
+  version = "1.1";
+  src = fetchurl {
+    url = "http://www.codon.org.uk/~mjg59/libx86/downloads/${name}.tar.gz";
+    sha256 = "0j6h6bc02c6qi0q7c1ncraz4d1hkm5936r35rfsp4x1jrc233wav";
+  };
+  patches = [./constants.patch ./non-x86.patch ];
 
   # using BACKEND=x86emu on 64bit systems fixes:
   #  http://www.mail-archive.com/[e-mail]/msg02355.html
   makeFlags = [
-    "DESTDIR=$out"
-  ] ++ a.stdenv.lib.optionals ( a.stdenv.isx86_64 || a.stdenv.isArm ) [ "BACKEND=x86emu" ];
+    "DESTDIR=$(out)"
+  ] ++ stdenv.lib.optional (stdenv.isx86_64 || stdenv.isArm) "BACKEND=x86emu";
 
-  fixX86Def = a.fullDepEntry (''
+  preBuild = ''
     sed -i lrmi.c -e 's@defined(__i386__)@(defined(__i386__) || defined(__x86_64__))@'
-  '') ["doUnpack" "minInit"];
-  killUsr = a.fullDepEntry (''
     sed -e s@/usr@@ -i Makefile
-  '') ["doUnpack" "minInit"];
-      
-  meta = {
+  '';
+
+  meta = with stdenv.lib; {
     description = "Real-mode x86 code emulator";
-    maintainers = [
-      a.lib.maintainers.raskin
-    ];
-    platforms = with a.lib.platforms; 
-      linux ++ freebsd ++ netbsd;
+    maintainers = with maintainers; [ raskin ];
+    platforms = with platforms; linux ++ freebsd ++ netbsd;
+    license = licenses.mit;
   };
 }

pkgs/top-level/all-packages.nix

···
 
   libwpg = callPackage ../development/libraries/libwpg { };
 
-  libx86 = builderDefsPackage ../development/libraries/libx86 {};
+  libx86 = callPackage ../development/libraries/libx86 {};
 
   libxdg_basedir = callPackage ../development/libraries/libxdg-basedir { };