diff --git a/pkgs/SpaceCadetPinball/default.nix b/pkgs/SpaceCadetPinball/default.nix
index 631e2b0..c55b672 100644
--- a/pkgs/SpaceCadetPinball/default.nix
+++ b/pkgs/SpaceCadetPinball/default.nix
@@ -55,4 +55,6 @@ stdenv.mkDerivation rec {
     cp ${spacecadet_files}/* $out/share/${pname}/
     ln -s $out/share/${pname}/SpaceCadetPinball $out/bin/SpaceCadetPinball
   '';
+
+  meta.platforms = [ "x86_64-linux" ];
 }
diff --git a/pkgs/binary-ninja-personal/default.nix b/pkgs/binary-ninja-personal/default.nix
index b295c68..5a2b0b5 100644
--- a/pkgs/binary-ninja-personal/default.nix
+++ b/pkgs/binary-ninja-personal/default.nix
@@ -93,4 +93,6 @@ stdenv.mkDerivation rec {
     # Below is just a hack to keep the zip from being garbage-collected.
     ln -s "${src}" "$out/share/BinaryNinja-personal.zip"
   '';
+
+  meta.platforms = [ "x86_64-linux" ];
 }
diff --git a/pkgs/default.nix b/pkgs/default.nix
index f17da5d..14ae3d7 100644
--- a/pkgs/default.nix
+++ b/pkgs/default.nix
@@ -1,17 +1,21 @@
 pkgs:
 let
   empty = pkgs.runCommand "empty" { } "mkdir $out";
-  x64 = x: if pkgs.system == "x86_64-linux" then x else empty;
+  pkg = path: args:
+    let
+      p = pkgs.callPackage path args;
+    in
+    if p.meta.available then p else empty;
 in
 rec
 {
-  binaryninja = x64 (pkgs.callPackage ./binary-ninja-personal { });
-  commander-x16 = pkgs.callPackage ./commander-x16 { };
-  gef = pkgs.callPackage ./gef { };
-  packettracer = x64 (pkgs.callPackage ./packettracer { });
-  security-toolbox = x64 (pkgs.callPackage ./security-toolbox { inherit gef webshells weevely; });
-  SpaceCadetPinball = x64 (pkgs.callPackage ./SpaceCadetPinball { });
-  stretchy-spaces = pkgs.callPackage ./stretchy-spaces { };
-  webshells = pkgs.callPackage ./webshells { };
-  weevely = pkgs.callPackage ./weevely { };
+  binaryninja = pkg ./binary-ninja-personal { };
+  commander-x16 = pkg ./commander-x16 { };
+  gef = pkg ./gef { };
+  packettracer = pkg ./packettracer { };
+  security-toolbox = pkg ./security-toolbox { inherit gef webshells weevely; };
+  SpaceCadetPinball = pkg ./SpaceCadetPinball { };
+  stretchy-spaces = pkg ./stretchy-spaces { };
+  webshells = pkg ./webshells { };
+  weevely = pkg ./weevely { };
 }
diff --git a/pkgs/packettracer/default.nix b/pkgs/packettracer/default.nix
index 56b4e4d..7a638bc 100644
--- a/pkgs/packettracer/default.nix
+++ b/pkgs/packettracer/default.nix
@@ -25,8 +25,6 @@
 
 }:
 
-assert stdenv.hostPlatform.system == "x86_64-linux";
-
 let
   version = "8.0.1";
 
@@ -108,4 +106,6 @@ buildFHSUserEnvBubblewrap {
     mkdir -p "$out/share/applications"
     cp "${desktopItem}"/share/applications/* "$out/share/applications/"
   '';
+
+  meta.platforms = [ "x86_64-linux" ];
 }
diff --git a/pkgs/security-toolbox/default.nix b/pkgs/security-toolbox/default.nix
index 4f29ce0..0e2d31f 100644
--- a/pkgs/security-toolbox/default.nix
+++ b/pkgs/security-toolbox/default.nix
@@ -77,4 +77,6 @@ symlinkJoin {
       (burpsuite.overrideAttrs (_: { meta = { }; }))
       (postman.overrideAttrs (_: { meta = { }; }))
     ];
+
+  meta.platforms = [ "x86_64-linux" ];
 }