Change into the INT2LM source code directory:
cd /$SPDIR/src/int2lm

Open the Fopts script with any text editor and change the fortran options according to your computer platform. Compile INT2LM:

If compilation is successful an executable $SPDIR/src/int2lm/bin/int2lm.exe is created.
If gmake is installed on your computing system you may try to perform a parallel make by typing:
gmake -j N
this results in a much faster compilation. Replace N by the number of requested processors.