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- correctly load required packages: perl, python, grib_apiecCodes, fcm if required.
- set OpenIFS environment variables: OIFS_CYCLE, OIFS_GRIB_DIR, OIFS_COMP, OIFS_BUILD, OIFS_DATA_DIR
- possibly set environment suitable for linking against the FDB library (see below) and load the FDB module (40r1 & 43r3.fdb only).
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