error when buildinging mkl algebra using osqp-python

[rockyb3]

python: 3.11
osqp: 1.0.0b1
osqp python: master branch
mkl: installed by "conda install mkl"

# Name                    Version                   Build  Channel

mkl                       2024.2.2            ha957f24_16 
mkl-devel                 2024.2.2            ha770c72_16 
mkl-include               2024.2.2            ha957f24_16 
mkl-service               2.4.2           py311h200a580_0 

environment variables:
OSQP_ALGEBRA_BACKEND=mkl
MKL_ROOT = "/home/username/.conda/envs/envname/lib"

I follow the doc https://osqp.org/docs/contributing/python.html#:~:text=%27builtin%27%5D-,Wrappers%20for%20mkl%20algebra,%C2%B6,-For%20building%20Python
and manually change the pyproject.toml file:

[tool.scikit-build.cmake.define]
OSQP_ALGEBRA_BACKEND = "mkl"
OSQP_EXT_MODULE_NAME = "ext_mkl"
CMAKE_OSX_ARCHITECTURES = {env="CMAKE_OSX_ARCHITECTURES"}

But got the error:

CMake Error at /tmp/tmpomj_tvpy/build/_deps/osqp-src/algebra/mkl/CMakeLists.txt:36 (find_package):
  Found package configuration file:
    /home/username/.conda/envs/envname/lib/cmake/mkl/MKLConfig.cmake
  but it set MKL_FOUND to FALSE so package "MKL" is considered to be NOT
  FOUND.  Reason given by package:

  The required variable MKL_VERSION_H has an invalid value
  "MKL_VERSION_H-NOTFOUND".

-- Configuring incomplete, errors occurred!
*** CMake configuration failed

[vineetbansal]

@rockyb3 - can you try the instructions at https://osqp.org/docs/get_started/python.html and see if they work better? They're largely the same as the link you pointed to, but perhaps more verbose.

In general, you shouldn't have to make any changes to any of the pyproject.toml files at all.

You might also want to try pip install osqp[mkl] (osqp-mkl wheels were released on pypi a couple of days ago and thus there should be no need to build these yourself), and see you can get it to work.