xprintidle-ng: refactor and patch configure.ac

configure.ac needs to be patched in order to build with newer gnulib
See https://github.com/NixOS/nixpkgs/pull/58416

pkgs/tools/X11/xprintidle-ng/default.nix

@@ -2,23 +2,28 @@
   , autoconf, automake, libtool, gettext, pkgconfig
   , git, perl, texinfo, help2man
 }:
-stdenv.mkDerivation rec {
-  version = "git-2015-09-01";
-  name = "${baseName}-${version}";
-  baseName = "xprintidle-ng";
 
-  buildInputs = [
-    libX11 libXScrnSaver libXext gnulib
-    autoconf automake libtool gettext pkgconfig  git perl 
-    texinfo help2man
-    ];
+stdenv.mkDerivation rec {
+  pname = "xprintidle-ng";
+  version = "git-2015-09-01";
+
   src = fetchFromGitHub {
     owner = "taktoa";
-    repo = "${baseName}";
+    repo = pname;
     rev = "9083ba284d9222541ce7da8dc87d5a27ef5cc592";
     sha256 = "0a5024vimpfrpj6w60j1ad8qvjkrmxiy8w1yijxfwk917ag9rkpq";
   };
 
+  postPatch = ''
+    substituteInPlace configure.ac \
+      --replace "AC_PREREQ([2.62])" "AC_PREREQ([2.63])"
+  '';
+
+  nativeBuildInputs = [ 
+    autoconf automake gettext git gnulib
+    help2man libtool perl pkgconfig texinfo
+  ];
+
   configurePhase = ''
     cp -r "${gnulib}" gnulib
     chmod a+rX,u+w -R gnulib
@@ -26,10 +31,15 @@ stdenv.mkDerivation rec {
     ./configure --prefix="$out"
   '';
 
+  buildInputs = [
+    libX11 libXScrnSaver libXext  
+  ];
+
   meta = {
     inherit  version;
     description = ''A command-line tool to print idle time from libXss'';
-    license = stdenv.lib.licenses.gpl2 ;
+    homepage = http://taktoa.me/xprintidle-ng/;
+    license = stdenv.lib.licenses.gpl2;
     maintainers = [stdenv.lib.maintainers.raskin];
     platforms = stdenv.lib.platforms.linux;
   };