Fortran coding

Greetings, I require advice on doing an assignment. I doing a research. I obtain a coding in Fortran 77. I did use several types of Fortran 77 software to compile the coding. I encounter a challenge where the Fortran 77 software I use cannot compile the coding. It cannot compile when facing sind. I have tried to define sind for the coding. I would like to ask on the Fortran 77 software which is suitable for compiling and executing the coding which has sind in it. Thank you.