Hi Philippe,
In the example of the config file mcRove provided, you can find the following lines:
cmd_obj: gfortran -fopenmp -c -O3 -ffixed-line-length-132 -DHAVE_MPI -fconvert=big-endian -frecord-marker=4 <mods> <incs> <f95name>
Adding the option -cpp to this line worked for my installation. It then looks like this:
cmd_obj: gfortran -cpp -fopenmp -c -O3 -ffixed-line-length-132 -DHAVE_MPI -fconvert=big-endian -frecord-marker=4 <mods> <incs> <f95name>
When an installation is unsuccesfull, it is also a good idea to do a clean installation when you try again (see line 15 in mcRove's example):
modules: clean system