ASSIGN statement in Fortran 77

[June-Chiew Han]

Dear Sir/Madam,

I am using gfortran to run a Fortran 77 source file for solving system 
of first order ordinary differential equations (source file DLSODE) 
downloaded from the Web.

The ASSIGN statement in Fortran 77 is deleted for newer Fortran version. 
The error outputted by gfortran was
"Warning: Deleted feature: ASSIGN statement at (1)".

Any idea in solving this is greatly appreciated.

Thanks.

Regards,
JC