error: lvalue required as left operand of assignment

[jiapei100]

My ENV:

• OS: Ubuntu 20.04.2
• Python: 3.8.10
• pip: 21.2.3

....../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_;
      |   ~~~~~~~~~~^~
....../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_;
      |   ~~~~~~~~~~~~^~
....../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_;
      |   ~~~~~~~~~~~~~^~
....../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_;
      |     ~~~~~~~~~~~~~^~
....../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_;
      |     ~~~~~~~~~~~~^~
....../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/src/npe_typedefs.cpp.o] Error 1
make[2]: Leaving directory '....../numpyeigen/build'
make[1]: *** [CMakeFiles/Makefile2:123: CMakeFiles/npe.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....