gfortran binaries for Windows
Stand-alone gfortran binaries for Windows are available as an installer. Download the installer, and run it (accept the GNU Public License, choose an directory to install gfortran, and let it work for you!). The installer sets your PATH environment variable, so that simply typing gfortran in a command prompt will run the compiler.
Please report any bugs to the fortran@gcc.gnu.org mailing-list.
See Windows for general GCC on Windows information.
Troubleshooting
I installed gfortran, and now what?
gfortran is now available from command-line. To open a command prompt, click on Start menu, choose Accessories and then Command Prompt, or choose Run and type "cmd". In the black window that opens, you can use gfortran to compile your Fortran code (assuming your program is file code.f95 in the current directory): gfortran code.f95 -o code.exe This creates an executable named code.exe.
When I type try to run gfortran, windows says "command not found"
The installer tries to add the gfortran program to your PATH environment variable, telling Windows where to look when you call for gfortran For this to work, the command prompt window must be openedafter the installation is complete Open a new prompt window, and try again!
I opened a new command prompt, after the installation completed, and it still says "command not found"
Check that you have indeed files in the directory you selected for installation (if you chose c:\gfortran as installation directory, you should have directories like c:\gfortran\bin c:\gfortran\include ... you should also have a file gfortran.exe in c:\gfortran\bin .
Now we have to tell Windows to look in c:\gfortran\bin for the compiler. Right click on My Computer, Properties, Advanced Tab, Environment Variables.
In the top section labeled "User variables for..." there may or may not be an entry called PATH. If there is, click on it, click edit, then add the following at the end of the line.
;c:\gfortran\bin
If there is not, click add.
Variable Name: PATH Variable Value: c:\gfortran\bin
Click okay enough times to get back to the desktop, and open a new command prompt. You can do this by either going to Start, Accessories, Command Prompt, or by clicking run, and typing in cmd .