diff --git a/build/_sandbox.py b/build/_sandbox.py
index 2450c537..8d1940b0 100644
--- a/build/_sandbox.py
+++ b/build/_sandbox.py
@@ -26,7 +26,7 @@ def main():
                 print("link", sf)
             os.makedirs(dirname(sf), exist_ok=True)
             try:
-                os.link(abspath(f), sf)
+                os.symlink(abspath(f), sf)
             except PermissionError:
                 shutil.copy(f, sf)
 
diff --git a/build/_zip.py b/build/_zip.py
new file mode 100755
index 00000000..f5a49d09
--- /dev/null
+++ b/build/_zip.py
@@ -0,0 +1,25 @@
+#!/usr/bin/python3
+
+from os.path import *
+import argparse
+import os
+from zipfile import ZipFile
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("-z", "--zipfile")
+    parser.add_argument("-v", "--verbose", action="store_true")
+    parser.add_argument("-f", "--file", nargs=2, action="append")
+    args = parser.parse_args()
+
+    assert args.zipfile, "You must specify a zipfile to create"
+
+    with ZipFile(args.zipfile, mode="w") as zf:
+        for zipname, filename in args.file:
+            if args.verbose:
+                print(filename, "->", zipname)
+            zf.write(filename, arcname=zipname)
+
+
+main()
diff --git a/extras/build.py b/extras/build.py
index b70321a8..671fbb2d 100644
--- a/extras/build.py
+++ b/extras/build.py
@@ -1,6 +1,9 @@
 from build.ab import simplerule, simplerule
 from build.utils import objectify
 from build.c import clibrary
+from build.zip import zip
+from glob import glob
+from os.path import *
 
 icons = ["fluxfile", "hardware", "icon", "imagefile"]
 
@@ -15,24 +18,17 @@ clibrary(
 )
 
 simplerule(
-    name="fluxengine_iconset",
+    name="fluxengine_icns",
     ins=["./icon.png"],
-    outs=["=fluxengine.iconset"],
+    outs=["=fluxengine.icns"],
     commands=[
-        "mkdir -p $[outs[0]]",
-        "sips -z 64 64 $[ins[0]] --out $[outs[0]]/icon_32x32@2x.png > /dev/null",
+        "mkdir -p fluxengine.iconset",
+        "sips -z 64 64 $[ins[0]] --out fluxengine.iconset/icon_32x32@2x.png > /dev/null",
+        "iconutil -c icns -o $[outs[0]] fluxengine.iconset",
     ],
     label="ICONSET",
 )
 
-simplerule(
-    name="fluxengine_icns",
-    ins=[".+fluxengine_iconset"],
-    outs=["=fluxengine.icns"],
-    commands=["iconutil -c icns -o $[outs[0]] $[ins[0]]"],
-    label="ICONUTIL",
-)
-
 simplerule(
     name="fluxengine_ico",
     ins=["./icon.png"],
@@ -40,3 +36,18 @@ simplerule(
     commands=["png2ico $[outs[0]] $[ins[0]]"],
     label="MAKEICON",
 )
+
+template_files = [
+    f
+    for f in glob(
+        "**", recursive=True, root_dir="extras/FluxEngine.app.template"
+    )
+    if isfile(join("extras/FluxEngine.app.template", f))
+]
+zip(
+    name="fluxengine_template",
+    items={
+        join("FluxEngine.app", k): join("extras/FluxEngine.app.template", k)
+        for k in template_files
+    },
+)
diff --git a/src/gui/build.py b/src/gui/build.py
index 1841f63b..f1cdd65c 100644
--- a/src/gui/build.py
+++ b/src/gui/build.py
@@ -58,38 +58,28 @@ cxxprogram(
 if config.osx:
     simplerule(
         name="fluxengine_pkg",
-        ins=[".+fluxengine_app"],
-        outs=["=FluxEngine.pkg"],
-        commands=[
-            "pkgbuild --quiet --install-location /Applications --component $[ins[0]] $[outs[0]]"
-        ],
-        label="PKGBUILD",
-    )
-
-    simplerule(
-        name="fluxengine_app",
         ins=[
             ".+gui",
             "extras+fluxengine_icns",
-            "extras/FluxEngine.app.template/",
+            "extras+fluxengine_template",
         ],
-        outs=["=FluxEngine.app"],
+        outs=["=FluxEngine.pkg"],
         commands=[
             "rm -rf $[outs[0]]",
-            "cp -a $[ins[2]] $[outs[0]]",
-            "touch $[outs[0]]",
-            "cp $[ins[0]] $[outs[0]]/Contents/MacOS/fluxengine-gui",
-            "mkdir -p $[outs[0]]/Contents/Resources",
-            "cp $[ins[1]] $[outs[0]]/Contents/Resources/FluxEngine.icns",
-            "dylibbundler -of -x $[outs[0]]/Contents/MacOS/fluxengine-gui -b -d $[outs[0]]/Contents/libs -cd > /dev/null",
-            "cp $$(brew --prefix wxwidgets)/README.md $[outs[0]]/Contents/libs/wxWidgets.md",
-            "cp $$(brew --prefix protobuf)/LICENSE $[outs[0]]/Contents/libs/protobuf.txt",
-            "cp $$(brew --prefix fmt)/LICENSE* $[outs[0]]/Contents/libs/fmt.rst",
-            "cp $$(brew --prefix libpng)/LICENSE $[outs[0]]/Contents/libs/libpng.txt",
-            "cp $$(brew --prefix libjpeg)/README $[outs[0]]/Contents/libs/libjpeg.txt",
-            "cp $$(brew --prefix abseil)/LICENSE $[outs[0]]/Contents/libs/abseil.txt",
-            "cp $$(brew --prefix libtiff)/LICENSE.md $[outs[0]]/Contents/libs/libtiff.txt",
-            "cp $$(brew --prefix zstd)/LICENSE $[outs[0]]/Contents/libs/zstd.txt",
+            "unzip -q $[ins[2]]",  # creates FluxEngine.app
+            "cp $[ins[0]] FluxEngine.app/Contents/MacOS/fluxengine-gui",
+            "mkdir -p FluxEngine.app/Contents/Resources",
+            "cp $[ins[1]] FluxEngine.app/Contents/Resources/FluxEngine.icns",
+            "dylibbundler -of -x FluxEngine.app/Contents/MacOS/fluxengine-gui -b -d FluxEngine.app/Contents/libs -cd > /dev/null",
+            "cp $$(brew --prefix wxwidgets)/README.md FluxEngine.app/Contents/libs/wxWidgets.md",
+            "cp $$(brew --prefix protobuf)/LICENSE FluxEngine.app/Contents/libs/protobuf.txt",
+            "cp $$(brew --prefix fmt)/LICENSE* FluxEngine.app/Contents/libs/fmt.rst",
+            "cp $$(brew --prefix libpng)/LICENSE FluxEngine.app/Contents/libs/libpng.txt",
+            "cp $$(brew --prefix libjpeg)/README FluxEngine.app/Contents/libs/libjpeg.txt",
+            "cp $$(brew --prefix abseil)/LICENSE FluxEngine.app/Contents/libs/abseil.txt",
+            "cp $$(brew --prefix libtiff)/LICENSE.md FluxEngine.app/Contents/libs/libtiff.txt",
+            "cp $$(brew --prefix zstd)/LICENSE FluxEngine.app/Contents/libs/zstd.txt",
+            "pkgbuild --quiet --install-location /Applications --component FluxEngine.app $[outs[0]]",
         ],
         label="MKAPP",
     )