Compilation error Python 3.10

[quantumadventure]

Hi,
I'm trying to compile ParOpt under pyenv with Python 3.10-dev. The compilation via make of the C-part is working fine. But when I run:

python3 setup.py install

I get:

Warning: passing language='c++' to cythonize() is deprecated. Instead, put "# distutils: language=c++" in your .pyx or .pxd file(s)
Compiling paropt/ParOpt.pyx because it changed.
Compiling paropt/ParOptEig.pyx because it changed.
[1/2] Cythonizing paropt/ParOpt.pyx
/.pyenv/versions/3.10-dev/lib/python3.10/site-packages/Cython/Compiler/Main.py:381: FutureWarning: Cython directive 'language_level' not set, using '3str' for now (Py3). This has changed from earlier releases! File: /optimizer/py/paropt/paropt/ParOpt.pxd
  tree = Parsing.p_module(s, pxd, full_module_name)

Error compiling Cython file:
------------------------------------------------------------
...

# Import the string library
from libcpp.string cimport string

# Import the declarations required from the pxd file
from ParOpt cimport *
^
------------------------------------------------------------

paropt/ParOpt.pyx:16:0: 'ParOpt.pxd' not found

Error compiling Cython file:
------------------------------------------------------------
...
    ndarray = np.PyArray_SimpleNewFromData(size, shape,
                                           nptype, data_ptr)

    if base is not None:
        Py_INCREF(base)
        ndarray.base = <PyObject*>base
               ^
------------------------------------------------------------

paropt/ParOpt.pyx:377:15: Assignment to a read-only property

Error compiling Cython file:
------------------------------------------------------------
...
        cdef MPI_Comm c_comm = comm.ob_mpi
        if nineq < 0:
            nineq = ncon
        self.me = new CyParOptProblem(c_comm, nvars, ncon, nineq, nwcon, nwblock)
        self.me.setSelfPointer(<void*>self)
        self.me.setGetVarsAndBounds(_getvarsandbounds)
                                    ^
------------------------------------------------------------

paropt/ParOpt.pyx:750:36: Cannot assign type 'void (void *, int, ParOptVec *, ParOptVec *, ParOptVec *) except *' to 'getvarsandbounds'

Error compiling Cython file:
------------------------------------------------------------
...
        if nineq < 0:
            nineq = ncon
        self.me = new CyParOptProblem(c_comm, nvars, ncon, nineq, nwcon, nwblock)
        self.me.setSelfPointer(<void*>self)
        self.me.setGetVarsAndBounds(_getvarsandbounds)
        self.me.setEvalObjCon(_evalobjcon)
                              ^
------------------------------------------------------------

paropt/ParOpt.pyx:751:30: Cannot assign type 'int (void *, int, int, ParOptVec *, ParOptScalar *, ParOptScalar *) except? -1' to 'evalobjcon'

Error compiling Cython file:
------------------------------------------------------------
...
            nineq = ncon
        self.me = new CyParOptProblem(c_comm, nvars, ncon, nineq, nwcon, nwblock)
        self.me.setSelfPointer(<void*>self)
        self.me.setGetVarsAndBounds(_getvarsandbounds)
        self.me.setEvalObjCon(_evalobjcon)
        self.me.setEvalObjConGradient(_evalobjcongradient)
                                      ^
------------------------------------------------------------

paropt/ParOpt.pyx:752:38: Cannot assign type 'int (void *, int, int, ParOptVec *, ParOptVec *, ParOptVec **) except? -1' to 'evalobjcongradient'

Error compiling Cython file:
------------------------------------------------------------
...
        self.me = new CyParOptProblem(c_comm, nvars, ncon, nineq, nwcon, nwblock)
        self.me.setSelfPointer(<void*>self)
        self.me.setGetVarsAndBounds(_getvarsandbounds)
        self.me.setEvalObjCon(_evalobjcon)
        self.me.setEvalObjConGradient(_evalobjcongradient)
        self.me.setEvalHvecProduct(_evalhvecproduct)
                                   ^
------------------------------------------------------------

paropt/ParOpt.pyx:753:35: Cannot assign type 'int (void *, int, int, int, ParOptVec *, ParOptScalar *, ParOptVec *, ParOptVec *, ParOptVec *) except? -1' to 'evalhvecproduct'

Error compiling Cython file:
------------------------------------------------------------
...
        self.me.setSelfPointer(<void*>self)
        self.me.setGetVarsAndBounds(_getvarsandbounds)
        self.me.setEvalObjCon(_evalobjcon)
        self.me.setEvalObjConGradient(_evalobjcongradient)
        self.me.setEvalHvecProduct(_evalhvecproduct)
        self.me.setEvalHessianDiag(_evalhessiandiag)
                                   ^
------------------------------------------------------------

paropt/ParOpt.pyx:754:35: Cannot assign type 'int (void *, int, int, int, ParOptVec *, ParOptScalar *, ParOptVec *, ParOptVec *) except? -1' to 'evalhessiandiag'

Error compiling Cython file:
------------------------------------------------------------
...
        self.me.setGetVarsAndBounds(_getvarsandbounds)
        self.me.setEvalObjCon(_evalobjcon)
        self.me.setEvalObjConGradient(_evalobjcongradient)
        self.me.setEvalHvecProduct(_evalhvecproduct)
        self.me.setEvalHessianDiag(_evalhessiandiag)
        self.me.setComputeQuasiNewtonUpdateCorrection(_computequasinewtonupdatecorrection)
                                                      ^
------------------------------------------------------------

paropt/ParOpt.pyx:755:54: Cannot assign type 'void (void *, int, int, ParOptVec *, ParOptScalar *, ParOptVec *, ParOptVec *, ParOptVec *) except *' to 'computequasinewtonupdatecorrection'

Error compiling Cython file:
------------------------------------------------------------
...
        self.me.setEvalObjCon(_evalobjcon)
        self.me.setEvalObjConGradient(_evalobjcongradient)
        self.me.setEvalHvecProduct(_evalhvecproduct)
        self.me.setEvalHessianDiag(_evalhessiandiag)
        self.me.setComputeQuasiNewtonUpdateCorrection(_computequasinewtonupdatecorrection)
        self.me.setEvalSparseCon(_evalsparsecon)
                                 ^
------------------------------------------------------------

paropt/ParOpt.pyx:756:33: Cannot assign type 'void (void *, int, int, ParOptVec *, ParOptVec *) except *' to 'evalsparsecon'

Error compiling Cython file:
------------------------------------------------------------
...
        self.me.setEvalObjConGradient(_evalobjcongradient)
        self.me.setEvalHvecProduct(_evalhvecproduct)
        self.me.setEvalHessianDiag(_evalhessiandiag)
        self.me.setComputeQuasiNewtonUpdateCorrection(_computequasinewtonupdatecorrection)
        self.me.setEvalSparseCon(_evalsparsecon)
        self.me.setAddSparseJacobian(_addsparsejacobian)
                                     ^
------------------------------------------------------------

paropt/ParOpt.pyx:757:37: Cannot assign type 'void (void *, int, int, ParOptScalar, ParOptVec *, ParOptVec *, ParOptVec *) except *' to 'addsparsejacobian'

Error compiling Cython file:
------------------------------------------------------------
...
        self.me.setEvalHvecProduct(_evalhvecproduct)
        self.me.setEvalHessianDiag(_evalhessiandiag)
        self.me.setComputeQuasiNewtonUpdateCorrection(_computequasinewtonupdatecorrection)
        self.me.setEvalSparseCon(_evalsparsecon)
        self.me.setAddSparseJacobian(_addsparsejacobian)
        self.me.setAddSparseJacobianTranspose(_addsparsejacobiantranspose)
                                              ^
------------------------------------------------------------

paropt/ParOpt.pyx:758:46: Cannot assign type 'void (void *, int, int, ParOptScalar, ParOptVec *, ParOptVec *, ParOptVec *) except *' to 'addsparsejacobiantranspose'

Error compiling Cython file:
------------------------------------------------------------
...
        self.me.setEvalHessianDiag(_evalhessiandiag)
        self.me.setComputeQuasiNewtonUpdateCorrection(_computequasinewtonupdatecorrection)
        self.me.setEvalSparseCon(_evalsparsecon)
        self.me.setAddSparseJacobian(_addsparsejacobian)
        self.me.setAddSparseJacobianTranspose(_addsparsejacobiantranspose)
        self.me.setAddSparseInnerProduct(_addsparseinnerproduct)
                                         ^
------------------------------------------------------------

paropt/ParOpt.pyx:759:41: Cannot assign type 'void (void *, int, int, int, ParOptScalar, ParOptVec *, ParOptVec *, ParOptScalar *) except *' to 'addsparseinnerproduct'
Traceback (most recent call last):
  File "/optimizer/py/paropt/setup.py", line 122, in <module>
    ext_modules=cythonize(exts, language="c++", include_path=inc_dirs),
  File "/.pyenv/versions/3.10-dev/lib/python3.10/site-packages/Cython/Build/Dependencies.py", line 1134, in cythonize
    cythonize_one(*args)
  File "/.pyenv/versions/3.10-dev/lib/python3.10/site-packages/Cython/Build/Dependencies.py", line 1301, in cythonize_one
    raise CompileError(None, pyx_file)
Cython.Compiler.Errors.CompileError: paropt/ParOpt.pyx

Any idea, how I can resolve this?

Thanks!