libiptcdata: fix build on darwin

pkgs/development/libraries/libiptcdata/default.nix

@@ -1,9 +1,13 @@
-{lib, stdenv, fetchurl}:
+{ lib, stdenv, fetchurl, libiconv }:
 
 stdenv.mkDerivation rec {
   pname = "libiptcdata";
   version = "1.0.4";
 
+  buildInputs = lib.optionals stdenv.isDarwin [
+    libiconv
+  ];
+
   src = fetchurl {
     url = "mirror://sourceforge/libiptcdata/${pname}-${version}.tar.gz";
     sha256 = "03pfvkmmx762iydq0q207x2028d275pbdysfsgpmrr0ywy63pxkr";
@@ -14,5 +18,6 @@ stdenv.mkDerivation rec {
     homepage = "http://libiptcdata.sourceforge.net/";
     license = lib.licenses.gpl2Plus;
     platforms = lib.platforms.unix;
+    maintainers = with lib.maintainers; [ wegank ];
   };
 }