Cannot build smc.c on Monterey

[mwkchan]

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I have this error when I tried to build smc.c

Michaels-iMac:smc michael$ make gcc -c smc.c smc.c:37:1: warning: 'OSSpinLock' is deprecated: first deprecated in macOS 10.12 - Use os_unfair_lock() from <os/lock.h> instead [-Wdeprecated-declarations] OSSpinLock g_keyInfoSpinLock = 0; ^ /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/libkern/OSSpinLockDeprecated.h:79:17: note: 'OSSpinLock' has been explicitly marked deprecated here typedef int32_t OSSpinLock OSSPINLOCK_DEPRECATED_REPLACE_WITH(os_unfair_lock); ^ smc.c:335:5: warning: 'OSSpinLockLock' is deprecated: first deprecated in macOS 10.12 - Use os_unfair_lock_lock() from <os/lock.h> instead [-Wdeprecated-declarations] OSSpinLockLock(&g_keyInfoSpinLock); ^ /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/libkern/OSSpinLockDeprecated.h:99:9: note: 'OSSpinLockLock' has been explicitly marked deprecated here void OSSpinLockLock( volatile OSSpinLock *__lock ); ^ smc.c:368:5: warning: 'OSSpinLockUnlock' is deprecated: first deprecated in macOS 10.12 - Use os_unfair_lock_unlock() from <os/lock.h> instead [-Wdeprecated-declarations] OSSpinLockUnlock(&g_keyInfoSpinLock); ^ /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/libkern/OSSpinLockDeprecated.h:105:9: note: 'OSSpinLockUnlock' has been explicitly marked deprecated here void OSSpinLockUnlock( volatile OSSpinLock *__lock ); ^ smc.c:384:23: warning: format string is not a string literal (potentially insecure) [-Wformat-security] sprintf(val->key, key); ^~~ /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/secure/_stdio.h:47:56: note: expanded from macro 'sprintf' __builtin___sprintf_chk (str, 0, __darwin_obsz(str), VA_ARGS) ^~~~~~~~~~~ smc.c:384:23: note: treat the string as an argument to avoid this sprintf(val->key, key); ^ "%s", /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/secure/_stdio.h:47:56: note: expanded from macro 'sprintf' __builtin___sprintf_chk (str, 0, __darwin_obsz(str), VA_ARGS) ^ 4 warnings generated. gcc -mmacosx-version-min=10.4 -Wall -g -framework IOKit -o smc smc.o Undefined symbols for architecture x86_64: "_main", referenced from: __start in crt1.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) make: *** [smc] Error 1 Michaels-iMac:smc michael$