Installing OSRM on Debian8, error upon error!! Why?

Question

linux

There is a server with Debian 8 installed.
The server is configured, git, cmake, sudo are installed.
I'm trying to deploy according to the instructions: https://habr.com/post/224731/ and https://github.com/Project-OSRM/osrm-backend/wiki/...
In particular, the first thing I enter in the console is:

sudo apt-get install git g++ cmake libboost-dev libboost-filesystem-dev libboost-thread-dev \
libboost-system-dev libboost-regex-dev libstxxl-dev libxml2-dev libsparsehash-dev libbz2-dev \
zlib1g-dev libzip-dev libgomp1 liblua5.1-0-dev \
pkg-config libgdal-dev libboost-program-options-dev libboost-iostreams-dev \
libboost-test-dev libtbb-dev libexpat1-dev

Then:

git clone https://github.com/Project-OSRM/osrm-backend.git

And after:
mkdir -p build; cd build; cmake ..; make
And this debilizm gives me as a result in the console:

CMake Error: The source directory "/root" does not appear to contain CMakeLists.txt.
Specify --help for usage, or press the help button on the CMake GUI.
make: *** No targets specified and no makefile found.  Stop.

In what there can be a problem of mind I will not give?

Answer 1

after
do

cd osrm-backend
mkdir -p build; cd build; cmake ..; make