Install cfortran by entering the following commands in the terminal:
sudo apt update sudo apt install cfortran
Header file permitting Fortran routines to be called in C/C++
cfortran.h is an easy-to-use powerful bridge between C and FORTRAN. It provides a completely transparent, machine independent interface between C and FORTRAN routines (= subroutines and/or functions) and global data, i.e. structures and COMMON blocks.