error: lvalue required as left operand of assignment

[jiapei100]

Failed to build libigl-python-bindings with ERROR message: error: lvalue required as left operand of assignment .

[  1%] Built target predicates
In file included from ....../libigl-python-bindings/external/numpyeigen/src/npe_typedefs.h:6,
                 from ....../libigl-python-bindings/external/numpyeigen/src/npe_typedefs.cpp:1:
....../libigl-python-bindings/external/numpyeigen/cmake/../src/npe_sparse_array.h: In function ‘pybind11::handle pybind11::detail::eigen_sparse_array_cast(Type*, pybind11::handle, bool)’:
....../libigl-python-bindings/external/numpyeigen/cmake/../src/npe_sparse_array.h:169:13: error: lvalue required as left operand of assignment
  169 |   data.flags() &= ~detail::npy_api::NPY_ARRAY_OWNDATA_;
      |   ~~~~~~~~~~^~
....../libigl-python-bindings/external/numpyeigen/cmake/../src/npe_sparse_array.h:172:15: error: lvalue required as left operand of assignment
  172 |   indptr.flags() &= ~detail::npy_api::NPY_ARRAY_OWNDATA_;
      |   ~~~~~~~~~~~~^~
....../libigl-python-bindings/external/numpyeigen/cmake/../src/npe_sparse_array.h:175:16: error: lvalue required as left operand of assignment
  175 |   indices.flags() &= ~detail::npy_api::NPY_ARRAY_OWNDATA_;
      |   ~~~~~~~~~~~~~^~
....../libigl-python-bindings/external/numpyeigen/cmake/../src/npe_sparse_array.h:182:18: error: lvalue required as left operand of assignment
  182 |     indices.flags() &= ~detail::npy_api::NPY_ARRAY_WRITEABLE_;
      |     ~~~~~~~~~~~~~^~
....../libigl-python-bindings/external/numpyeigen/cmake/../src/npe_sparse_array.h:183:17: error: lvalue required as left operand of assignment
  183 |     indptr.flags() &= ~detail::npy_api::NPY_ARRAY_WRITEABLE_;
      |     ~~~~~~~~~~~~^~
....../libigl-python-bindings/external/numpyeigen/cmake/../src/npe_sparse_array.h:184:15: error: lvalue required as left operand of assignment
  184 |     data.flags() &= ~detail::npy_api::NPY_ARRAY_WRITEABLE_;
      |     ~~~~~~~~~~^~
make[2]: *** [CMakeFiles/npe.dir/build.make:79: CMakeFiles/npe.dir/external/numpyeigen/src/npe_typedefs.cpp.o] Error 1
make[2]: Leaving directory '....../libigl-python-bindings/build_20.04'
make[1]: *** [CMakeFiles/Makefile2:196: CMakeFiles/npe.dir/all] Error 2
make[1]: Leaving directory '....../libigl-python-bindings/build_20.04'
make: *** [Makefile:104: all] Error 2