AVRFreaks.net

#if defined A   
  FUSES = {
    .low = 0xFF,
    .high = (FUSE_SPIEN & FUSE_JTAGEN & FUSE_OCDEN),
    .extended = 0xFF,};
  LOCKBITS = (LB_MODE_1 & BLB0_MODE_1 & BLB1_MODE_1);
#elif defined B
  FUSES = {
    .low = 0xFF,
    .high = (FUSE_SPIEN),
    .extended = 0xFF,};
  LOCKBITS = (LB_MODE_3 & BLB0_MODE_1 & BLB1_MODE_1);
#else
...

avrdude -patmega644p -cavrisp2 -Pusb -e -V -u -Uflash:w:file.elf -Ueeprom:w:file.elf -Uhfuse:w:file.elf -Ulfuse:w:file.elf -Uefuse:w:file.elf -Ulock:w:file.elf

avrdude man pages
-U memtype:op:filename[:format]
                   Perform a memory operation as indicated.  The memtype field
                   specifies the memory type to operate on.  The available
                   memory types are device-dependent, the actual configuration
                   can be viewed with the part command in terminal mode.  Typ‐
                   ically, a device’s memory configuration at least contains
                   the memory types flash and eeprom.  All memory types cur‐
                   rently known are:
                   calibration  One or more bytes of RC oscillator calibration
                                data.
                   eeprom       The EEPROM of the device.
                   efuse        The extended fuse byte.
     
             flash        The flash ROM of the device.
                   fuse         The fuse byte in devices that have only a sin‐
                                gle fuse byte.
                   hfuse        The high fuse byte.
                   lfuse        The low fuse byte.
                   lock         The lock byte.
                   signature    The three device signature bytes (device ID).

avr-objdump -d -S -j.fuse file.elf
file.elf:     file format elf32-avr
Disassembly of section .fuse:
00820000 <__fuse>:
  820000:   ff 1f ff