#key - Table of content structure Table of Contents Introduction Build System Structure Top Level Makefile Local Customization local.mk Second Level Makefile Defaults mk/default.mk Make Targets mk/targets.mk Utilities mk/org-fixup.el Make Targets Help Configuration Check Build Test Installation Documentation Cleaning Compatibility and Convenience Customization Simple Customization Default target Including sources from contrib/ Non-standard Emacs location XEmacs Emacs on Windows Advanced Customization Compilation Methods Multiple Emacsen Selective Testing Support for Installers Support for Manual Build