parllel NWChem 6.1.1 vs Ubuntu 12.04


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Just Got Here
HI everybody,
I'm trying to <ompile NWChem 6.1.1 on Ubuntu, using MPICH as the parallel library.
The error I get is:

cmpif90 -c -i8 -g  -I.  -I/home/jacopo/Scaricati/nwchem-6.1.1-src/src/include -I/home/jacopo/Scaricati/nwchem-6.1.1-src/src/tools/install/include -DEXT_INT -DLINUX -DLINUX64 -DPARALLEL_DIAG -DBASIS_LIBRARY="'/home/jacopo/Scaricati/nwchem-6.1.1-src/src'"  basis.F
mpif90 -c -i8 -g  -I.  -I/home/jacopo/Scaricati/nwchem-6.1.1-src/src/include -I/home/jacopo/Scaricati/nwchem-6.1.1-src/src/tools/install/include -DEXT_INT -DLINUX -DLINUX64 -DPARALLEL_DIAG -DBASIS_LIBRARY="'/home/jacopo/Scaricati/nwchem-6.1.1-src/src'"  bas_input.F
gfortran: error: unrecognized command line option -i8
gfortran: error: unrecognized command line option -i8
make[1]: *** [/home/jacopo/Scaricati/nwchem-6.1.1-src/lib/LINUX64/libnwcutil.a(basis.o)] Errore 1
make[1]: *** Attesa per i processi non terminati....
make[1]: *** [/home/jacopo/Scaricati/nwchem-6.1.1-src/lib/LINUX64/libnwcutil.a(bas_input.o)] Errore 1
make: *** [libraries] Errore 1


both using commands

make FC=mpif90 CC=mpicc

and
make FC=mpif90.mpich2 CC=mpicc.mpich2


My variables:
$LIBMPI: -lmpich -lopa -lmpl -lrt -lpthread
$MPI_LIB:  /usr/lib/mpich2/lib/


Any idea on what could be wrong?
Thank you!