bfr: update source url, fix build and adopt it

pkgs/tools/misc/bfr/default.nix

···
 { stdenv, fetchurl, perl }:
 
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   name = "bfr-1.6";
+  version = "1.6";
 
   src = fetchurl {
-    url = http://www.glines.org/bin/pk/bfr-1.6.tar.bz2;
+    url = "http://www.sourcefiles.org/Utilities/Text_Utilities/bfr-${version}.tar.bz2";
     sha256 = "0fadfssvj9klj4dq9wdrzys1k2a1z2j0p6kgnfgbjv0n1bq6h4cy";
   };
 
   buildInputs = [ perl ];
 
-  meta = {
-    description = "general-purpose command-line pipe buffer";
+  meta = with stdenv.lib; {
+    description = "A general-purpose command-line pipe buffer";
     homepage = http://www.glines.org/wiki/bfr;
     license = stdenv.lib.licenses.gpl2;
+    maintainers = with maintainers; [ pSub ];
+    platforms = platforms.linux;
   };
 }

pkgs/top-level/all-packages.nix

···
 
   bchunk = callPackage ../tools/cd-dvd/bchunk { };
 
-  bfr = callPackage ../tools/misc/bfr { };
+  bfr = callPackage ../tools/misc/bfr { perl = perl516; };
 
   bindfs = callPackage ../tools/filesystems/bindfs { };