Add package 'bibtool'.

pkgs/tools/misc/bibtool/default.nix

@@ -0,0 +1,25 @@
+{ stdenv, fetchurl, perl }:
+
+stdenv.mkDerivation rec {
+  name = "bibtool-${version}";
+  version = "2.57";
+
+  src = fetchurl {
+    url = "http://www.gerd-neugebauer.de/software/TeX/BibTool/BibTool-${version}.tar.gz";
+    sha256 = "1g3yqywnbg04imkcqx7ypq0din81vcgq90k2xlqih69blbqpfb5y";
+  };
+
+  # Perl for running test suite.
+  buildInputs = [ perl ];
+
+  installTargets = "install install.man";
+
+  doCheck = true;
+
+  meta = with stdenv.lib; {
+    description = "Tool for manipulating BibTeX bibliographies";
+    homepage = http://www.gerd-neugebauer.de/software/TeX/BibTool/index.en.html;
+    license = licenses.gpl1;
+    maintainers = [ maintainers.rycee ];
+  };
+}

pkgs/top-level/all-packages.nix

@@ -617,6 +617,8 @@ let
     perl = perl516; # Docs fail to build with newer versions
   };
 
+  bibtool = callPackage ../tools/misc/bibtool { };
+
   bindfs = callPackage ../tools/filesystems/bindfs { };
 
   binwalk = callPackage ../tools/misc/binwalk {