compiling nwchem with mpich2


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/opt/mpich2/gnu/bin/mpif90 -c -i8 -g -I. -I/home/fan_group/nwchem-6.1.1/src/include -I/home/fan_group/nwchem-6.1.1/src/tools/install/include -DEXT_INT -DLINUX -DLINUX64 -DPARALLEL_DIAG -DBASIS_LIBRARY="'/home/fan_group/nwchem-6.1.1/src'" basis.F
/opt/mpich2/gnu/bin/mpif90 -c -i8 -g -I. -I/home/fan_group/nwchem-6.1.1/src/include -I/home/fan_group/nwchem-6.1.1/src/tools/install/include -DEXT_INT -DLINUX -DLINUX64 -DPARALLEL_DIAG -DBASIS_LIBRARY="'/home/fan_group/nwchem-6.1.1/src'" bas_input.F
cc1: error: unrecognized command line option "-i8"
cc1: error: unrecognized command line option "-i8"
make[1]: *** [/home/fan_group/nwchem-6.1.1/lib/LINUX64/libnwcutil.a(basis.o)] Error 1
make[1]: *** Waiting for unfinished jobs....
make[1]: *** [/home/fan_group/nwchem-6.1.1/lib/LINUX64/libnwcutil.a(bas_input.o)] Error 1
make: *** [libraries] Error 1