The problem seems to be due to the new version of wannier90-2.0.0 (compiled with the current Intel compiler)

The variables list of wannier_setup (src/wannier_lib.F90) has two additions compared to wannier90-1.2:

proj_s_loc
proj_s_qaxis_loc

which are "optional, intent(out)".

VASP does not (yet) use these quantities, and as such, calls wannier_setup without them.
This should not be a problem, since these variables are declared as optionals, but apparently the ifort compiler messes up (we have not tried other compilers).

Solution:

1) delete these 2 parameters from the call list of wannier_setup in wannier_lib.F90
2) comment out all lines in wannier_setup referring to these variables,