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gcc -Wall -g -O2 -L/opt/vc/lib -I/opt/vc/include -o servod servod.c mailbox.c -lm -lbcm_host servod.c: In function ‘get_model_and_revision’: servod.c:994:6: warning: implicit declaration of function ‘bcm_host_is_model_pi4’; did you mean ‘bcm_host_deinit’? [-Wimplicit-function-declaration]   if (bcm_host_is_model_pi4()) {       ^~~~~~~~~~~~~~~~~~~~~       bcm_host_deinit servod.c: In function ‘main’: servod.c:1383:19: warning: implicit declaration of function ‘bcm_host_get_model_type’; did you mean ‘bcm_host_get_sdram_address’? [-Wimplicit-function-declaration]    int bcm_model = bcm_host_get_model_type();                    ^~~~~~~~~~~~~~~~~~~~~~~                    bcm_host_get_sdram_address /usr/bin/ld: /tmp/ccTGda9C.o: in function `get_model_and_revision': /home/pi/PiBits/ServoBlaster/user/servod.c:994: undefined reference to `bcm_host_is_model_pi4' /usr/bin/ld: /tmp/ccTGda9C.o: in function `main': /home/pi/PiBits/ServoBlaster/user/servod.c:1383: undefined reference to `bcm_host_get_model_type' collect2: error: ld returned 1 exit status make: *** [Makefile:6: servod] 오류 1 pi@raspberrypi:~/PiBits/ServoBlaster/user $ make servod 'gcc -Wall -g -O2 -L/opt/vc/lib -I/opt/vc/include -o servod servod.c mailbox.c -lm -lbcm_host servod.c: In function ‘get_model_and_revision’: servod.c:994:6: warning: implicit declaration of function ‘bcm_host_is_model_pi4’; did you mean ‘bcm_host_deinit’? [-Wimplicit-function-declaration]   if (bcm_host_is_model_pi4()) {       ^~~~~~~~~~~~~~~~~~~~~       bcm_host_deinit servod.c: In function ‘main’: servod.c:1383:19: warning: implicit declaration of function ‘bcm_host_get_model_type’; did you mean ‘bcm_host_get_sdram_address’? [-Wimplicit-function-declaration]    int bcm_model = bcm_host_get_model_type();                    ^~~~~~~~~~~~~~~~~~~~~~~                    bcm_host_get_sdram_address /usr/bin/ld: /tmp/cckA28YR.o: in function `get_model_and_revision': /home/pi/PiBits/ServoBlaster/user/servod.c:994: undefined reference to `bcm_host_is_model_pi4' /usr/bin/ld: /tmp/cckA28YR.o: in function `main': /home/pi/PiBits/ServoBlaster/user/servod.c:1383: undefined reference to `bcm_host_get_model_type' collect2: error: ld returned 1 exit status make: *** [Makefile:6: servod] 오류 1      int bcm_model 선언이 문제인지 아니면 bcm_host_get_model_type(); 이 문제인지 잘 모르겠습니다. 일단   라즈베리파이 모델은 라즈베리3 모델 B+ 입니다. 이유 좀 알고 싶어요.