diff --git a/pkgs/development/libraries/xmlsec/default.nix b/pkgs/development/libraries/xmlsec/default.nix
index 3fba451c711..85e2f08b31d 100644
--- a/pkgs/development/libraries/xmlsec/default.nix
+++ b/pkgs/development/libraries/xmlsec/default.nix
@@ -19,6 +19,6 @@ stdenv.mkDerivation rec {
     homepage = http://www.aleksey.com/xmlsec;
     description = "XML Security Library in C based on libxml2";
     license = stdenv.lib.licenses.mit;
-    platforms = stdenv.lib.platforms.linux;
+    platforms = with stdenv.lib.platforms; linux ++ darwin;
   };
 }
diff --git a/pkgs/tools/security/oath-toolkit/default.nix b/pkgs/tools/security/oath-toolkit/default.nix
index 8f96a5067d1..216ce3d2336 100644
--- a/pkgs/tools/security/oath-toolkit/default.nix
+++ b/pkgs/tools/security/oath-toolkit/default.nix
@@ -1,5 +1,10 @@
-{ stdenv, fetchurl, pam }:
+{ stdenv, fetchurl, pam, xmlsec }:
 
+let
+  securityDependency =
+    if stdenv.isDarwin then xmlsec
+    else pam;
+in
 stdenv.mkDerivation rec {
   name = "oath-toolkit-2.4.1";
 
@@ -8,11 +13,12 @@ stdenv.mkDerivation rec {
     sha256 = "094vbq66sn5f2dsy14hajpsfdnaivjxf70xzs91nrsq0q75l5ylv";
   };
 
-  buildInputs = [ pam ];
+  
+  buildInputs = [ securityDependency ];
 
   meta = {
     homepage = http://www.nongnu.org/oath-toolkit/;
     description = "Components for building one-time password authentication systems";
-    platforms = stdenv.lib.platforms.linux;
+    platforms = with stdenv.lib.platforms; linux ++ darwin;
   };
 }