diff --git a/package-lock.json b/package-lock.json
index 1655227..f93a2e6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,566 +1,5 @@
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-    },
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-      "requires": {
-        "isexe": "^2.0.0"
-      }
-    },
-    "wrappy": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
-    },
-    "xtend": {
-      "version": "4.0.2",
-      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
-      "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ=="
-    },
-    "yauzl": {
-      "version": "2.10.0",
-      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.10.0.tgz",
-      "integrity": "sha1-x+sXyT4RLLEIb6bY5R+wZnt5pfk=",
-      "requires": {
-        "buffer-crc32": "~0.2.3",
-        "fd-slicer": "~1.1.0"
-      }
-    }
-  }
+    "name": "@financial-times/sass",
+    "version": "1",
+    "lockfileVersion": 1
 }
diff --git a/package.json b/package.json
index 3fd9c8d..93055e7 100644
--- a/package.json
+++ b/package.json
@@ -6,11 +6,11 @@
     "repository": "Financial-times/sass",
     "bin": "sass.bat",
     "optionalDependencies": {
-        "@financial-times/sass-linux-ia32": "*",
-        "@financial-times/sass-linux-x64": "*",
-        "@financial-times/sass-macos-x64": "*",
-        "@financial-times/sass-windows-ia32": "*",
-        "@financial-times/sass-windows-x64": "*"
+        "@financial-times/sass-linux-ia32": "file:./sass-linux-ia32",
+        "@financial-times/sass-linux-x64": "file:./sass-linux-x64",
+        "@financial-times/sass-macos-x64": "file:./sass-macos-x64",
+        "@financial-times/sass-windows-ia32": "file:./sass-windows-ia32",
+        "@financial-times/sass-windows-x64": "file:./sass-windows-x64"
     },
     "scripts": {
         "postinstall": "node ./postinstall.js",
diff --git a/postinstall.js b/postinstall.js
index 4fb830d..3be448a 100644
--- a/postinstall.js
+++ b/postinstall.js
@@ -4,65 +4,69 @@ const fs = require("fs");
 const path = require("path");
 
 let platformSpecificPackagePath;
-if (process.platform === "win32" && process.arch === "x64") {
-  platformSpecificPackagePath = require.resolve("@financial-times/sass-windows-x64");
-} else if (process.platform === "win32" && process.arch === "ia32") {
-  platformSpecificPackagePath = require.resolve("@financial-times/sass-windows-ia32");
-} else if (process.platform === "darwin") {
-  platformSpecificPackagePath = require.resolve("@financial-times/sass-macos-x64");
-} else if (process.platform === "linux" && process.arch === "x64") {
-  platformSpecificPackagePath = require.resolve("@financial-times/sass-linux-x64");
-} else if (process.platform === "linux" && process.arch === "ia32") {
-  platformSpecificPackagePath = require.resolve("@financial-times/sass-linux-ia32");
+const windows64bit = process.platform === "win32" && process.arch === "x64";
+const windows32bit = process.platform === "win32" && process.arch === "ia32";
+const mac = process.platform === "darwin";
+const linux64bit = process.platform === "linux" && process.arch === "x64";
+const linux32bit = process.platform === "linux" && process.arch === "ia32";
+
+if (windows64bit) {
+  platformSpecificPackagePath = require.resolve(
+    "@financial-times/sass-windows-x64"
+  );
+} else if (windows32bit) {
+  platformSpecificPackagePath = require.resolve(
+    "@financial-times/sass-windows-ia32"
+  );
+} else if (mac) {
+  platformSpecificPackagePath = require.resolve(
+    "@financial-times/sass-macos-x64"
+  );
+} else if (linux64bit) {
+  platformSpecificPackagePath = require.resolve(
+    "@financial-times/sass-linux-x64"
+  );
+} else if (linux32bit) {
+  platformSpecificPackagePath = require.resolve(
+    "@financial-times/sass-linux-ia32"
+  );
 } else {
   throw new Error(
     "@financial-times/sass does not have a precompiled binary for the platform/architecture you are using. Please contact Origami or open an issue on https://github.com/Financial-Times/sass/issues"
   );
 }
 
-const platformSpecificSassPath = path.join(path.dirname(platformSpecificPackagePath), 'dart-sass')
-
-// We need to remove the sass entrypoint file if it exists already.
-if (fs.existsSync(path.join(__dirname, './sass.bat'))) {
-  fs.unlinkSync(path.join(__dirname, './sass.bat'));
-}
+const platformSpecificSassPath = path.join(
+  path.dirname(platformSpecificPackagePath),
+  "dart-sass"
+);
 
 // Create our own sass entrypoint which uses absolute paths to the dartvm and snapshot.
 // This will ensure it works when symlinked to, which the entrypoint file in dart-sass
 // does not support on macos.
-if (process.platform === "win32") {
-  fs.writeFileSync(
-    path.join(__dirname, "sass.bat"),
-    `
-  @echo off
-  REM This script drives the standalone dart-sass package, which bundles together a
-  REM Dart executable and a snapshot of dart-sass.
-  
-  set SCRIPTPATH=%~dp0
-  set arguments=%*
-  "${path.join(platformSpecificSassPath, "/src/dart.exe")}" "${path.join(
-    platformSpecificSassPath,
-    "/src/sass.dart.snapshot"
-  )}" %arguments%
-`,
-    {
-      encoding: "utf-8",
-      mode: 0o777
-    }
-  );
-} else {
-  fs.writeFileSync(
-    path.join(__dirname, "sass.bat"),
-    `
+const windowsEntrypoint = `
+@echo off
+REM This script drives the standalone dart-sass package, which bundles together a
+REM Dart executable and a snapshot of dart-sass.
+
+set SCRIPTPATH=%~dp0
+set arguments=%*
+"${path.join(platformSpecificSassPath, "/src/dart.exe")}" "${path.join(
+  platformSpecificSassPath,
+  "/src/sass.dart.snapshot"
+)}" %arguments%`;
+
+const linuxAndMacEntrypoint = `
 #!/bin/sh
 exec "${path.join(platformSpecificSassPath, "/src/dart")}" "${path.join(
-      platformSpecificSassPath,
-      "/src/sass.dart.snapshot"
-    )}" "$@"
-`,
-    {
-      encoding: "utf-8",
-      mode: 0o777
-    }
-  );
-}
+  platformSpecificSassPath,
+  "/src/sass.dart.snapshot"
+)}" "$@"`;
+
+const windows = windows64bit || windows32bit;
+const entrypoint = windows ? windowsEntrypoint : linuxAndMacEntrypoint;
+
+fs.writeFileSync(path.join(__dirname, "sass.bat"), entrypoint, {
+  encoding: "utf-8",
+  mode: 0o777
+});
diff --git a/sass-linux-ia32/package.json b/sass-linux-ia32/package.json
index ab2b667..7bb5331 100644
--- a/sass-linux-ia32/package.json
+++ b/sass-linux-ia32/package.json
@@ -12,5 +12,8 @@
   ],
   "cpu": [
     "ia32"
-  ]
+  ],
+  "scripts": {
+    "postinstall": "node ./postinstall.js"
+  }
 }
diff --git a/sass-linux-ia32/postinstall.js b/sass-linux-ia32/postinstall.js
new file mode 100644
index 0000000..da3a5af
--- /dev/null
+++ b/sass-linux-ia32/postinstall.js
@@ -0,0 +1,23 @@
+"use strict";
+
+const { name, os, cpu } = require("./package.json");
+
+if (os && !os.includes(process.platform)) {
+  throw new Error(
+    `${name} does not support the platform you are using. You are using: "${
+      process.platform
+    }" and ${name} supports: ${os.join(
+      ","
+    )}. If you think this is a mistake, please contact Origami or open an issue on https://github.com/Financial-Times/sass/issues`
+  );
+}
+
+if (cpu && !cpu.includes(process.arch)) {
+  throw new Error(
+    `${name} does not support the cpu you are using. You are using: "${
+      process.arch
+    }" and ${name} supports: ${cpu.join(
+      ","
+    )}. If you think this is a mistake, please contact Origami or open an issue on https://github.com/Financial-Times/sass/issues`
+  );
+}
diff --git a/sass-linux-x64/package.json b/sass-linux-x64/package.json
index 4cf4212..07b6905 100644
--- a/sass-linux-x64/package.json
+++ b/sass-linux-x64/package.json
@@ -12,5 +12,8 @@
   ],
   "cpu": [
     "x64"
-  ]
+  ],
+  "scripts": {
+    "postinstall": "node ./postinstall.js"
+  }
 }
diff --git a/sass-linux-x64/postinstall.js b/sass-linux-x64/postinstall.js
new file mode 100644
index 0000000..da3a5af
--- /dev/null
+++ b/sass-linux-x64/postinstall.js
@@ -0,0 +1,23 @@
+"use strict";
+
+const { name, os, cpu } = require("./package.json");
+
+if (os && !os.includes(process.platform)) {
+  throw new Error(
+    `${name} does not support the platform you are using. You are using: "${
+      process.platform
+    }" and ${name} supports: ${os.join(
+      ","
+    )}. If you think this is a mistake, please contact Origami or open an issue on https://github.com/Financial-Times/sass/issues`
+  );
+}
+
+if (cpu && !cpu.includes(process.arch)) {
+  throw new Error(
+    `${name} does not support the cpu you are using. You are using: "${
+      process.arch
+    }" and ${name} supports: ${cpu.join(
+      ","
+    )}. If you think this is a mistake, please contact Origami or open an issue on https://github.com/Financial-Times/sass/issues`
+  );
+}
diff --git a/sass-macos-x64/package.json b/sass-macos-x64/package.json
index 574c5ed..6319dde 100644
--- a/sass-macos-x64/package.json
+++ b/sass-macos-x64/package.json
@@ -9,5 +9,8 @@
   },
   "os": [
     "darwin"
-  ]
+  ],
+  "scripts": {
+    "postinstall": "node ./postinstall.js"
+  }
 }
diff --git a/sass-macos-x64/postinstall.js b/sass-macos-x64/postinstall.js
new file mode 100644
index 0000000..da3a5af
--- /dev/null
+++ b/sass-macos-x64/postinstall.js
@@ -0,0 +1,23 @@
+"use strict";
+
+const { name, os, cpu } = require("./package.json");
+
+if (os && !os.includes(process.platform)) {
+  throw new Error(
+    `${name} does not support the platform you are using. You are using: "${
+      process.platform
+    }" and ${name} supports: ${os.join(
+      ","
+    )}. If you think this is a mistake, please contact Origami or open an issue on https://github.com/Financial-Times/sass/issues`
+  );
+}
+
+if (cpu && !cpu.includes(process.arch)) {
+  throw new Error(
+    `${name} does not support the cpu you are using. You are using: "${
+      process.arch
+    }" and ${name} supports: ${cpu.join(
+      ","
+    )}. If you think this is a mistake, please contact Origami or open an issue on https://github.com/Financial-Times/sass/issues`
+  );
+}
diff --git a/sass-windows-ia32/package.json b/sass-windows-ia32/package.json
index b197791..76b368f 100644
--- a/sass-windows-ia32/package.json
+++ b/sass-windows-ia32/package.json
@@ -12,5 +12,8 @@
   ],
   "cpu": [
     "ia32"
-  ]
+  ],
+  "scripts": {
+    "postinstall": "node ./postinstall.js"
+  }
 }
diff --git a/sass-windows-ia32/postinstall.js b/sass-windows-ia32/postinstall.js
new file mode 100644
index 0000000..da3a5af
--- /dev/null
+++ b/sass-windows-ia32/postinstall.js
@@ -0,0 +1,23 @@
+"use strict";
+
+const { name, os, cpu } = require("./package.json");
+
+if (os && !os.includes(process.platform)) {
+  throw new Error(
+    `${name} does not support the platform you are using. You are using: "${
+      process.platform
+    }" and ${name} supports: ${os.join(
+      ","
+    )}. If you think this is a mistake, please contact Origami or open an issue on https://github.com/Financial-Times/sass/issues`
+  );
+}
+
+if (cpu && !cpu.includes(process.arch)) {
+  throw new Error(
+    `${name} does not support the cpu you are using. You are using: "${
+      process.arch
+    }" and ${name} supports: ${cpu.join(
+      ","
+    )}. If you think this is a mistake, please contact Origami or open an issue on https://github.com/Financial-Times/sass/issues`
+  );
+}
diff --git a/sass-windows-x64/package.json b/sass-windows-x64/package.json
index c2ce832..1dd39e0 100644
--- a/sass-windows-x64/package.json
+++ b/sass-windows-x64/package.json
@@ -12,5 +12,8 @@
   ],
   "cpu": [
     "x64"
-  ]
+  ],
+  "scripts": {
+    "postinstall": "node ./postinstall.js"
+  }
 }
diff --git a/sass-windows-x64/postinstall.js b/sass-windows-x64/postinstall.js
new file mode 100644
index 0000000..da3a5af
--- /dev/null
+++ b/sass-windows-x64/postinstall.js
@@ -0,0 +1,23 @@
+"use strict";
+
+const { name, os, cpu } = require("./package.json");
+
+if (os && !os.includes(process.platform)) {
+  throw new Error(
+    `${name} does not support the platform you are using. You are using: "${
+      process.platform
+    }" and ${name} supports: ${os.join(
+      ","
+    )}. If you think this is a mistake, please contact Origami or open an issue on https://github.com/Financial-Times/sass/issues`
+  );
+}
+
+if (cpu && !cpu.includes(process.arch)) {
+  throw new Error(
+    `${name} does not support the cpu you are using. You are using: "${
+      process.arch
+    }" and ${name} supports: ${cpu.join(
+      ","
+    )}. If you think this is a mistake, please contact Origami or open an issue on https://github.com/Financial-Times/sass/issues`
+  );
+}