xml-security-c: fix build on darwin, small clean up

pkgs/development/libraries/xml-security-c/default.nix

@@ -2,19 +2,23 @@
   lib,
   stdenv,
   fetchurl,
+  pkg-config,
   xalanc,
   xercesc,
   openssl,
-  pkg-config,
+  darwin,
 }:
 
-stdenv.mkDerivation rec {
+let
+  inherit (darwin.apple_sdk.frameworks) CoreFoundation CoreServices SystemConfiguration;
+in
+stdenv.mkDerivation (finalAttrs: {
   pname = "xml-security-c";
   version = "2.0.4";
 
   src = fetchurl {
-    url = "mirror://apache/santuario/c-library/${pname}-${version}.tar.gz";
-    sha256 = "sha256-p42mcg9sK6FBANJCYTHg0z6sWi26XMEb3QSXS364kAM=";
+    url = "mirror://apache/santuario/c-library/xml-security-c-${finalAttrs.version}.tar.gz";
+    hash = "sha256-p42mcg9sK6FBANJCYTHg0z6sWi26XMEb3QSXS364kAM=";
   };
 
   configureFlags = [
@@ -25,10 +29,16 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ pkg-config ];
 
-  buildInputs = [
+  buildInputs =
+    [
       xalanc
       xercesc
       openssl
+    ]
+    ++ lib.optionals stdenv.isDarwin [
+      CoreFoundation
+      CoreServices
+      SystemConfiguration
     ];
 
   meta = {
@@ -38,4 +48,4 @@ stdenv.mkDerivation rec {
     platforms = lib.platforms.unix;
     maintainers = [ lib.maintainers.jagajaga ];
   };
-}
+})