Usage:
   emacs-build [--version] [--help] [--features]
                    [--branch b] [--clone] [--build] [--deps]
                    [--slim] [--[no-]compress] [--[no-]strip]
                    [--with-all] [--without-X] [--with-X]
                    [--pdf-tools] [--aspell] [--hunspell] [--mu] [--isync]
                    [--pack-emacs] [--pack-all]
Actions:
   --build       Configure and build Emacs from sources.
   --clean       Remove all directories except sources and zip files.
   --clone       Download Savannah's git repository for Emacs.
   --deps        Create a ZIP file with all the Mingw64/32 dependencies.
   --help        Output this help message, --features and exit.
   --pack-emacs  Package an Emacs previously built with the --build option.
   --pack-all    Package an Emacs previously built, with all the Mingw64/32
                 dependencies, as well as all extensions (see Extensions below).
   --features    Shows all active and inactive features for the selected options.
   --version     Output emacs-build version number and exit.

   Multiple actions can be selected. The default is to run them all in a logical
   order: clone, build, deps and pack-all.

Build options:
   --branch b    Select Emacs branch (or tag) 'b' for the remaining operations.
   --compress    Ship Emacs with gunzip and compress documentation and Emacs
                 script files.
   --debug       Output all statements run by the script.
   --debug-dependencies
                 Describe which MSYS/MINGW packages depend on which, and
                 which files are discarded from the ZIP files.
   --no-strip    Disable the --strip option.
   --no-compress Disable the --compress option.
   --slim        Remove Cairo, SVG and TIFF support for a slimmer build.
                 Remove also documentation files and other support files
                 from the dependencies file. Activate --compress and
                 --strip. (Default configuration)
   --strip       Strip executables and DLL's from debug information.
   --with-all    Add all Emacs features.
   --with-*      Add requested feature in the dependencies and build
                 * is any of the known features for emacs in Windows/Mingw
                 (see --features).
   --without-*   Remove requested feature in the dependencies and build.

   Options are processed in order. Thus --slim followed by --with-cairo
   would enable Cairo, even though --slim removes it.

Extensions:
   --pdf-tools   Build and package PDF-TOOLS.
   --hunspell    Install Hunspell spell checker.
   --aspell      Install Aspell spell checker.
   --mu          Mail search system and supporting Emacs mu4e libraries.
   --isync       Synchronize email from IMAP/POP to Maildir format (mbsync).

Environment variables:
  msys2_dir      Windows path to a preexisting MSY2 installation