Installing Mesaflash on RPi4 64

pi@raspberrypi:~/Desktop/mesaflash/mesaflash-master $ make
gcc -O0 -g -Wall -Werror=format -Werror=format-security -std=c99 -D_GNU_SOURCE  -c common.c
gcc -O0 -g -Wall -Werror=format -Werror=format-security -std=c99 -D_GNU_SOURCE  -c lbp.c
lbp.c: In function ‘lbp_read’:
lbp.c:75:15: warning: variable ‘recv’ set but not used [-Wunused-but-set-variable]
     int send, recv;
               ^~~~
lbp.c:75:9: warning: variable ‘send’ set but not used [-Wunused-but-set-variable]
     int send, recv;
         ^~~~
lbp.c: In function ‘lbp_write’:
lbp.c:92:9: warning: variable ‘send’ set but not used [-Wunused-but-set-variable]
     int send;
         ^~~~
gcc -O0 -g -Wall -Werror=format -Werror=format-security -std=c99 -D_GNU_SOURCE  -c lbp16.c
lbp16.c: In function ‘lbp16_read’:
lbp16.c:39:9: warning: variable ‘send’ set but not used [-Wunused-but-set-variable]
     int send, recv;
         ^~~~
lbp16.c: In function ‘lbp16_write’:
lbp16.c:61:9: warning: variable ‘send’ set but not used [-Wunused-but-set-variable]
     int send;
         ^~~~
lbp16.c: In function ‘lbp16_board_reset’:
lbp16.c:75:9: warning: variable ‘send’ set but not used [-Wunused-but-set-variable]
     int send;
         ^~~~
lbp16.c: In function ‘lbp16_board_reload’:
lbp16.c:86:9: warning: variable ‘send’ set but not used [-Wunused-but-set-variable]
     int send;
         ^~~~
gcc -O0 -g -Wall -Werror=format -Werror=format-security -std=c99 -D_GNU_SOURCE  -c bitfile.c
gcc -O0 -g -Wall -Werror=format -Werror=format-security -std=c99 -D_GNU_SOURCE  -c hostmot2.c
gcc -O0 -g -Wall -Werror=format -Werror=format-security -std=c99 -D_GNU_SOURCE  -c eeprom.c
gcc -O0 -g -Wall -Werror=format -Werror=format-security -std=c99 -D_GNU_SOURCE  -c anyio.c
gcc -O0 -g -Wall -Werror=format -Werror=format-security -std=c99 -D_GNU_SOURCE  -c eth_boards.c
eth_boards.c: In function ‘eth_scan_one_addr’:
eth_boards.c:140:9: warning: variable ‘send’ set but not used [-Wunused-but-set-variable]
     int send = 0, recv = 0, ret = 0;
         ^~~~
gcc -O0 -g -Wall -Werror=format -Werror=format-security -std=c99 -D_GNU_SOURCE  -c epp_boards.c
epp_boards.c:22:10: fatal error: sys/io.h: No such file or directory
 #include <sys/io.h>
          ^~~~~~~~~~
compilation terminated.
make: *** [Makefile:109: epp_boards.o] Error 1