diff --git a/pkgs/tools/compression/xdelta/default.nix b/pkgs/tools/compression/xdelta/default.nix
index ee52f35c979..fbaab91d093 100644
--- a/pkgs/tools/compression/xdelta/default.nix
+++ b/pkgs/tools/compression/xdelta/default.nix
@@ -56,6 +56,6 @@ in stdenv.mkDerivation rec {
     '';
     homepage = "http://xdelta.org/";
     license = licenses.gpl2Plus;
-    platforms = platforms.linux;
+    platforms = platforms.unix;
   };
 }
diff --git a/pkgs/tools/misc/fwup/default.nix b/pkgs/tools/misc/fwup/default.nix
index e2b6df253a9..f58b73a4723 100644
--- a/pkgs/tools/misc/fwup/default.nix
+++ b/pkgs/tools/misc/fwup/default.nix
@@ -59,7 +59,7 @@ stdenv.mkDerivation rec {
     xdelta
   ];
 
-  doCheck = true;
+  doCheck = !stdenv.isDarwin;
 
   meta = with lib; {
     description = "Configurable embedded Linux firmware update creator and runner";