Atmega_Board_Programmer Compilation Error on IDE 1.8.13

[skeptronus]

avrdude log: In file included from /home/user/Arduino/arduino_sketches-1.10/Atmega_Board_Programmer/Atmega_Board_Programmer.ino:108:0: bootloader_atmega168.h:3:34: error: variable 'atmega168_optiboot' must be const in order to be put into read-only section by means of 'attribute((progmem))' byte PROGMEM atmega168_optiboot [] = { ^ In file included from /home/user/Arduino/arduino_sketches-1.10/Atmega_Board_Programmer/Atmega_Board_Programmer.ino:109:0: bootloader_atmega328.h:3:34: error: variable 'atmega328_optiboot' must be const in order to be put into read-only section by means of 'attribute((progmem))' byte PROGMEM atmega328_optiboot [] = { ^ In file included from /home/user/Arduino/arduino_sketches-1.10/Atmega_Board_Programmer/Atmega_Board_Programmer.ino:110:0: bootloader_atmega2560_v2.h:3:29: error: variable 'atmega2560_v2' must be const in order to be put into read-only section by means of 'attribute((progmem))' byte PROGMEM atmega2560_v2 [] = { ^ In file included from /home/user/Arduino/arduino_sketches-1.10/Atmega_Board_Programmer/Atmega_Board_Programmer.ino:111:0: bootloader_atmega1284.h:5:40: error: variable 'optiboot_atmega1284p_hex' must be const in order to be put into read-only section by means of 'attribute((progmem))' byte PROGMEM optiboot_atmega1284p_hex [] = { ^ In file included from /home/user/Arduino/arduino_sketches-1.10/Atmega_Board_Programmer/Atmega_Board_Programmer.ino:112:0: bootloader_lilypad328.h:5:53: error: variable 'ATmegaBOOT_168_atmega328_pro_8MHz_hex' must be const in order to be put into read-only section by means of 'attribute((progmem))' byte PROGMEM ATmegaBOOT_168_atmega328_pro_8MHz_hex [] = { ^ In file included from /home/user/Arduino/arduino_sketches-1.10/Atmega_Board_Programmer/Atmega_Board_Programmer.ino:113:0: bootloader_atmega1280.h:5:45: error: variable 'ATmegaBOOT_168_atmega1280_hex' must be const in order to be put into read-only section by means of 'attribute((progmem))' byte PROGMEM ATmegaBOOT_168_atmega1280_hex [] = { ^ exit status 1 variable 'atmega168_optiboot' must be const in order to be put into read-only section by means of 'attribute((progmem))'

etc. Tested both v.1.11 and 1.10. other sketches compile just fine.

[skeptronus]

const byte PROGMEM needs to be used instead of byte PROGMEM in the bootloader_*.h codes