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Compiling on aarch64 with gfortran + gcc

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I could be wrong about this, but it looks like the settings would be the same as those for
#ARCH Linux i486 i586 i686, gfortran # serial serial_NO_GRIB2 dmpar dmpar_NO_GRIB2

Just as a test, can you try to copy that section in WPS/arch/configure.defaults and just rename the section to
#ARCH Linux i486 i586 i686, armv71 aarch64, gfortran # serial serial_NO_GRIB2 dmpar dmpar_NO_GRIB2

Then save that file and try to reconfigure to see if that shows up for you and whether it works, using the configuration you want.