I wish to build the latest development version of Emacs from source. I've browsed to https://savannah.gnu.org/projects/emacs and executed the command suggested on the front page, namely
git clone -b master git://git.sv.gnu.org/emacs.git
I then read the INSTALL file, which says
2a. 'cd' to the directory where you unpacked Emacs and invoke the 'configure' script:
I followed these instructions, but this resulted in the following error message:
-bash: ./configure: No such file or directory
Inspecting the directory where I unpacked Emacs, I see that there is indeed no file named 'configure'. The closest matches are the files 'config.bat' and 'configure.ac'.
Why isn't there a 'configure' file in my installation directory? How do I proceed from here?
I run macOS Sierra version 10.12.5 .