diff --git a/make_installer.sh b/make_installer.sh
new file mode 100644
index 0000000..d529d35
--- /dev/null
+++ b/make_installer.sh
@@ -0,0 +1,17 @@
+#!/bin/zsh
+
+export tmp='/Volumes/disk01/tmp'
+
+# hdiutil attach InstallESD.dmg -noverify -nobrowse -mountpoint /Volumes/install_app
+hdiutil convert /Volumes/install_app/BaseSystem.dmg -format UDSP -o $tmp/Installer
+hdiutil resize -size 8g $tmp/Installer.sparseimage
+hdiutil attach $tmp/Installer.sparseimage -noverify -nobrowse -mountpoint /Volumes/install_build
+rm -r /Volumes/install_build/System/Installation/Packages
+cp -av /Volumes/install_app/Packages /Volumes/install_build/System/Installation/
+cp -av /Volumes/install_app/BaseSystem.chunklist /Volumes/install_build
+cp -av /Volumes/install_app/BaseSystem.dmg /Volumes/install_build
+hdiutil detach /Volumes/install_app
+hdiutil detach /Volumes/install_build
+hdiutil resize -size `hdiutil resize -limits $tmp/Installer.sparseimage | tail -n 1 | awk '{print $ 1}' `b $tmp/Installer.sparseimage
+hdiutil convert $tmp/Installer.sparseimage -format UDZO -o $tmp/Installer
+mv $tmp/Installer.dmg /Volumes/disk01/macos
\ No newline at end of file