Variable: emacs-build-number
emacs-build-number is a variable defined in version.el.gz.
Value
1
Documentation
The build number of this version of Emacs.
This is an integer that increments each time Emacs is built in a given directory (without cleaning). This is likely to only be relevant when developing Emacs.
Probably introduced at or before Emacs version 26.1.
Source Code
;; Defined in /usr/src/emacs/lisp/version.el.gz
(defconst emacs-build-number 1 ; loadup.el may increment this
"The build number of this version of Emacs.
This is an integer that increments each time Emacs is built in a given
directory (without cleaning). This is likely to only be relevant when
developing Emacs.")