Program parameters with ISO 7185

I was a co-author of an algorithm written in Pascal (ISO 7185) which read: PROGRAM stvpas(datafile, output); {This program counts the votes in a Single Transferable Vote election, using Meek's method, and reports the results} ... The datafile was reread on every iteration of the algorithm. Am I correct in stating that that the program cannot be run with gpc without making a change to the program to assign datafile to an external file? Brian.