compile make file

[ericash0923]

getting this error when running make command

/hdr -I./src/qvoronoi -std=c++0x src/dipole/mpi.cpp
src/dipole/mpi.cpp: In function 'int dipole::internal::send_cells_demag_factor(std::vector&, std::vector&, int)':
src/dipole/mpi.cpp:562:20: error: invalid conversion from 'const void*' to 'void*' [-fpermissive]
MPI_Isend(&num_send_cells, 1, MPI_INT, 0, 120, MPI_COMM_WORLD, &requests.back());
^~~~~~~~~~~~~~~
In file included from ./hdr/vmpi.hpp:36:0,
from ./hdr/vio.hpp:40,
from src/dipole/mpi.cpp:24:
/usr/local/include/mpi.h:577:5: note: initializing argument 1 of 'int MPI_Isend(void*, int, MPI_Datatype, int, int, MPI_Comm, MPI_Request*)'
int MPI_Isend(void*, int, MPI_Datatype, int, int, MPI_Comm, MPI_Request *);
^~~~~~~~~
makefile:247: recipe for target 'obj/dipole/mpi_mpi.o' failed