Change into the CCLM source code directory:
cd /$SPDIR/src/cclm

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

If compilation is successful an executable $SPDIR/src/cclm/bin/cclm.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.