No INSTALL file to read... May want to update the README
"
Installation
See the file 'INSTALL'. If you are not using a released version of
cinnamon-desktop (for example, if you checked out the code from git), you
first need to run './autogen.sh'.
"
Looks like this line is left over from when Gnome's README was copied in the initial fork commit. There has actually never been an INSTALL file in this repo!
No INSTALL file to read... May want to update the README
" Installation
See the file 'INSTALL'. If you are not using a released version of cinnamon-desktop (for example, if you checked out the code from git), you first need to run './autogen.sh'. "