The FCM software is required to compile the OSM code, make is not used. Either use the FCM copy bundled with OpenIFS or the Single Column Model. Or, download FCM from the UK Meteorological Office.
Set your environment
Before trying to compile OpenIFS, make sure the FCM is added to your PATH environment variable so the fcm command can be found (if you already have fcm available on your system, we still recommend using the version distributed with OpenIFS)
export PATH=$PATH:$HOME/ecmwf/oifs/fcm/bin
At ECMWF
The script compile_fcm.ksh is provided that correctly sets the environment by using module load command and then comp