MPI GPU compilation fails

I am trying to follow the steps for compiling this add-on for CUDA and it looks like it does not compile due to missing enums.

Is CUDA implementation complete at all?

I am getting below error after running make -j mpi_gpu:

Compiling LAMMPS for machine mpi_gpu
make[1]: Entering directory '/home/docker/lammps/src/Obj_mpi_gpu'
make[1]: Leaving directory '/home/docker/lammps/src/Obj_mpi_gpu'
make[1]: Entering directory '/home/docker/lammps/src/Obj_mpi_gpu'
mpicxx -g -O3 -std=c++11 -DFIX_EPH_GPU  -DLAMMPS_GZIP -DLAMMPS_MEMALIGN=64   -DLMP_GPU  -DMPICH_SKIP_MPICXX -DOMPI_SKIP_MPICXX=1      -c ../fix_eph_gpu.cpp
../fix_eph_gpu.cpp: In member function ‘virtual void LAMMPS_NS::FixEPHGPU::post_force(int)’:
../fix_eph_gpu.cpp:137:23: error: ‘XIX’ is not a member of ‘LAMMPS_NS::FixEPH::FixState’; did you mean ‘XI’?
  137 |     state = FixState::XIX;
      |                       ^~~
      |                       XI
../fix_eph_gpu.cpp:138:11: error: ‘class LAMMPS_NS::Comm’ has no member named ‘forward_comm_fix’; did you mean ‘forward_comm’?
  138 |     comm->forward_comm_fix(this);
      |           ^~~~~~~~~~~~~~~~
      |           forward_comm
../fix_eph_gpu.cpp:139:23: error: ‘XIY’ is not a member of ‘LAMMPS_NS::FixEPH::FixState’; did you mean ‘XI’?
  139 |     state = FixState::XIY;
      |                       ^~~
      |                       XI
../fix_eph_gpu.cpp:140:11: error: ‘class LAMMPS_NS::Comm’ has no member named ‘forward_comm_fix’; did you mean ‘forward_comm’?
  140 |     comm->forward_comm_fix(this);
      |           ^~~~~~~~~~~~~~~~
      |           forward_comm
../fix_eph_gpu.cpp:141:23: error: ‘XIZ’ is not a member of ‘LAMMPS_NS::FixEPH::FixState’; did you mean ‘XI’?
  141 |     state = FixState::XIZ;
      |                       ^~~
      |                       XI
../fix_eph_gpu.cpp:142:11: error: ‘class LAMMPS_NS::Comm’ has no member named ‘forward_comm_fix’; did you mean ‘forward_comm’?
  142 |     comm->forward_comm_fix(this);
      |           ^~~~~~~~~~~~~~~~
      |           forward_comm
../fix_eph_gpu.cpp:153:9: error: ‘class LAMMPS_NS::Comm’ has no member named ‘forward_comm_fix’; did you mean ‘forward_comm’?
  153 |   comm->forward_comm_fix(this);
      |         ^~~~~~~~~~~~~~~~
      |         forward_comm
../fix_eph_gpu.cpp: In member function ‘void LAMMPS_NS::FixEPHGPU::force_prl()’:
../fix_eph_gpu.cpp:227:21: error: ‘WX’ is not a member of ‘LAMMPS_NS::FixEPH::FixState’; did you mean ‘WI’?
  227 |   state = FixState::WX;
      |                     ^~
      |                     WI
../fix_eph_gpu.cpp:228:9: error: ‘class LAMMPS_NS::Comm’ has no member named ‘forward_comm_fix’; did you mean ‘forward_comm’?
  228 |   comm->forward_comm_fix(this);
      |         ^~~~~~~~~~~~~~~~
      |         forward_comm
../fix_eph_gpu.cpp:229:21: error: ‘WY’ is not a member of ‘LAMMPS_NS::FixEPH::FixState’; did you mean ‘WI’?
  229 |   state = FixState::WY;
      |                     ^~
      |                     WI
../fix_eph_gpu.cpp:230:9: error: ‘class LAMMPS_NS::Comm’ has no member named ‘forward_comm_fix’; did you mean ‘forward_comm’?
  230 |   comm->forward_comm_fix(this);
      |         ^~~~~~~~~~~~~~~~
      |         forward_comm
../fix_eph_gpu.cpp:231:21: error: ‘WZ’ is not a member of ‘LAMMPS_NS::FixEPH::FixState’; did you mean ‘WI’?
  231 |   state = FixState::WZ;
      |                     ^~
      |                     WI
../fix_eph_gpu.cpp:232:9: error: ‘class LAMMPS_NS::Comm’ has no member named ‘forward_comm_fix’; did you mean ‘forward_comm’?
  232 |   comm->forward_comm_fix(this);
      |         ^~~~~~~~~~~~~~~~
      |         forward_comm
make[1]: *** [Makefile:125: fix_eph_gpu.o] Error 1

Reproduce the reported failure with make -j mpi_gpu and inspect fix_eph_gpu.cpp, especially the FixEPHGPU::post_force and force_prl locations named in the compiler output. Compare the referenced FixState members and communication call with the available interfaces; done means the MPI GPU target compiles without these errors.