Add ipv6calc: calculate/manipulate (not only) IPv6 addresses

pkgs/tools/networking/ipv6calc/default.nix

@@ -0,0 +1,49 @@
+{ stdenv, fetchurl, geoip, getopt, openssl, perl }:
+
+stdenv.mkDerivation rec {
+  version = "0.97.4";
+  name = "ipv6calc-${version}";
+
+  src = fetchurl {
+    url = "ftp://ftp.bieringer.de/pub/linux/IPv6/ipv6calc/${name}.tar.gz";
+    sha256 = "0ffzqflvm6pfzgjsr3mzq7pwvshhl3h92rg4waza7zyvby4rwb7d";
+  };
+
+  buildInputs = [ geoip getopt openssl perl ];
+
+  patchPhase = ''
+    for i in {,databases/}lib/Makefile.in; do
+      substituteInPlace $i --replace /sbin/ldconfig true
+    done
+    for i in {{,databases/}lib,man}/Makefile.in; do
+      substituteInPlace $i --replace DESTDIR out
+    done
+  '';
+
+  configureFlags = ''
+    --disable-bundled-getopt
+    --disable-bundled-md5
+    --disable-dynamic-load
+    --enable-shared
+    --enable-geoip
+    --with-geoip-db=${geoip}/share/GeoIP
+  '';
+
+  enableParallelBuilding = true;
+
+  meta = with stdenv.lib; {
+    description = "Calculate/manipulate (not only) IPv6 addresses";
+    longDescription = ''
+      ipv6calc is a small utility to manipulate (not only) IPv6 addresses and
+      is able to do other tricky things. Intentions were convering a given
+      IPv6 address into compressed format, convering a given IPv6 address into
+      the same format like shown in /proc/net/if_inet6 and (because it was not
+      difficult) migrating the Perl program ip6_int into.
+      Now only one utiltity is needed to do a lot.
+    '';
+    homepage = http://www.deepspace6.net/projects/ipv6calc.html;
+    license = with licenses; gpl2;
+    platforms = with platforms; linux;
+    maintainers = with maintainers; [ nckx ];
+  };
+}

pkgs/top-level/all-packages.nix

@@ -1549,6 +1549,8 @@ let
 
   ipmiutil = callPackage ../tools/system/ipmiutil {};
 
+  ipv6calc = callPackage ../tools/networking/ipv6calc {};
+
   ipxe = callPackage ../tools/misc/ipxe { };
 
   ised = callPackage ../tools/misc/ised {};