Run the installer and follow the prompts. It is highly recommended to keep the default installation path ( C:\msys2 ). Step 2: Install the 64-bit GNU Fortran Compiler
To run the compiler from the standard Windows Command Prompt (CMD), add it to your System Path:
Open Watcom is a legendary, open-source C/C++ and Fortran 77 development suite. While it is older, a dedicated community continues to maintain it for modern Windows environments. fortran 77 compiler for windows 10 64-bit free download
Download the FTN95 Personal Edition installer from the Silverfrost website.
Test your installation by creating a simple FORTRAN 77 program. 1. Write the Code Run the installer and follow the prompts
Click and paste the path to your compiler's bin directory (for example: C:\msys64\mingw64\bin or your unzipped WinLibs folder path). Click OK to save and exit all windows. Step 4: Verify the Installation Open a new Windows Command Prompt ( cmd ). Type the following command and press Enter: gfortran --version Use code with caution.
To compile code from the standard Windows Command Prompt (CMD) or PowerShell, you must add the toolchain to your System PATH. While it is older, a dedicated community continues
with: gfortran -std=legacy -Wall myprogram.f -o myprogram.exe
Fear not. You do not need to pay for expensive commercial suites like Intel Visual Fortran to compile legacy code. There are excellent, free, open-source solutions available today.
This guide details the best free solutions available, step-by-step installation instructions, and how to successfully compile your first program. The Best Free Fortran 77 Compilers for Windows 10