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Download Enoch bootloader from http://www.insanelymac.com/forum/ (requires registration).
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Using Pacifist open the “Enoch-rev.####.pkg” file and extract the file called "boot" from Core.pkg/usr/standalone/i386/boot
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Rename boot to enoch_rev####_boot.
If you want a larger VNC screen add the following to the bootloader config in /Extra/org.chameleon.boot.plist:
<key>Graphics Mode</key>
<string>1440x900x32</string>
Type the following after boot,
"KernelBooter_kexts"="Yes" "CsrActiveConfig"="103"
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Install Pacifist on OS X.
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Mount "InstallESD.dmg" file.
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With Pacifist browse to the above volume (use the "Open Apple Installers" menu option) and then open "Essentials.pkg". Extract the folder & file (Kernels/kernel) located at /System/Library/Kernels/kernel location.
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After extracting the Kernels folder, place it in the same directory as the ISO creation script.
Put "org.chameleon.boot.plist" in /Extra folder.
Name: Mac OS X El Capitan
Version: 10.11.1 (15B42) InstallESD
Mac Platform: Intel
Untouched InstallESD.dmg file from the full 10.11.1 (Build 15B42) installer.
"Install OS X El Capitan.app/Contents/SharedSupport/InstallESD.dmg"
MD5: 3332a4e05713366343e03ee6777c3374
Release Date: October 21, 2015
jar -xf <zipfile>
is pretty neat.
Move 'InstallESD.dmg' to '/Applications/Install OS X El Capitan.app/Contents/SharedSupport/InstallESD.dmg' location.