Recover the ability to use std compilation flag in FFLAGS

    elif [ "x$cut_arg" = "x--with-fflags" ]; then

	custom_flags=$(echo $arg | cut -d '=' -f2)

	if [ "x$custom_flags" != "x" ]; then

	    num_characters=${#custom_flags}

	    if [ $num_characters -gt 4 ]; then

		if [ "x${custom_flags:$num_characters-4:4}" = "x-std" ]; then

		    std_flags=$(echo $arg | cut -d '=' -f3)

		    custom_flags="${custom_flags}=${std_flags}"

		fi

	    fi

	    FFLAGS=$custom_flags

	fi

    elif [ "x$cut_arg" = "x--with-hdf5" ]; then