Documentation on Getting started with C++ is wrong/outdated.

[krishvk]

What version of OR-Tools and what language are you using?
Version: or-tools_x86_64_Ubuntu-22.04_cpp_v9.6.2534
Language: C++

Which solver are you using (e.g. CP-SAT, Routing Solver, GLOP, BOP, Gurobi)
CP-SAT

What operating system (Linux, Windows, ...) and version?
Ubuntu-22.04

What did you do?
Steps to reproduce the behavior:

1. Downloaded and extracted the or-tools for Ubuntu 22.04 LTS from https://developers.google.com/optimization/install/cpp/binary_linux
2. Saved the example from https://developers.google.com/optimization/introduction/cpp into a file ../program.cc
3. Ran make run SOURCE=../program.cc as said on the above page
4. Error message: make: *** No rule to make target 'examples/program/CMakeLists.txt', needed by 'build'. Stop.

Tried creating a CMakeList.txt file beside the program.cc

> mkdir ../program
> mv ../program.cc ../program
> cp examples/knapsack/CMakeLists.txt ../program
> sed -i 's#knapsack#program#g' ../program/CMakeLists.txt
> make run SOURCE=../program/program.cc

Still the same error

make: *** No rule to make target 'examples/program/CMakeLists.txt', needed by 'build'. Stop.

Moved the directory to the examples directory and ran it again and it worked now

mv ../program examples
make run SOURCE=examples/program/program.cc

I think

1. The documentation should be updated
2. The flow should be simpler as before. Should be possible to run remotely

Please do let me know if I am missing anything

[lperron]

Duplicate of #3558