Explicitly Declare ALL Variables
Please do not use compiler options to set the floating point precision! (NO f77 –r8 …)
Use the NTCC conversion scripts r8_convert and r8_convert_include:
First, apply r8_convert to all *.f files.
Next, apply r8_convert_include to all the Fortran include files used by the *.f.
Fortran 90 codes ... you have to do it the long way.