If CPU time is not an issue, 'make bootstrap' is the most thorough way
to rebuild, and avoid any spurious problems.
-Users of non-Posix systems (MS-Windows, etc.) should run the
-platform-specific configuration scripts ('nt/configure.bat',
-'config.bat', etc.) before 'make'; the rest of the procedure is
-applicable to those systems as well.
-
Because the repository version of Emacs is a work in progress, it will
sometimes fail to build. Please wait a day or so (and check the
archives of the emacs-buildstatus, emacs-devel, and bug-gnu-emacs