How to install or-tools?

[growly]

I cannot find usable instructions on how to install or-tools. READMEs and online documentation seem to be out of date.

'make install_cc' does not work.

make: *** No rule to make target 'install_cc'.  Stop.

The CMake build instructions do not work:

cmake -S. -Bbuild
cmake --build build

fail because

-- Found Protobuf: /usr/local/lib/libprotobuf.so;-lpthread (found version "3.18.1") 
-- SCIP_ROOT: 
CMake Error at cmake/FindSCIP.cmake:67 (message):
  SCIP_ROOT: not found

... even though all documentation I've seen suggests that SCIP should now just be included with or-tools.

I found this on both the stable and main branches from a fresh clone today. I downloaded the v9.5 source and attempted it there, same results.

In the v9.5 source I then spied a build_make directory. In there I can issue make install to some effect, and it seems to have used the root extraction directory as the prefix. Is that how you do it?

What version of OR-Tools and what language are you using?
Version: stable/main/v9.5
Language: C++

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

What operating system (Linux, Windows, ...) and version?
Debian (sid from about 12 months ago)

[growly]

I'm not sure, but this is possibly a duplicate of:

• CMake build instructions (Make is deprecated) #3558.
• Install issues with make install_cc #3455 also seems to complains about this but the solution for a system-wide install there is to "use CMake directly", but as shown that doesn't work for me either.

[growly]

I seem to have gotten it to work with make cpp INSTALL_DIR=/usr/local

[lperron]

As you said. Duplicate.

We are rewriting the docs.

You should add -DBUILD_DEPS=ON when using cmake to build the libraries.
ref: https://github.com/google/or-tools/tree/main/cmake#cmake-options