cc -pthread   -Wall -Wextra -Werror=implicit-function-declaration sys_mman/posix_mem_offset.c -o sys_mman/posix_mem_offset -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt  -lgdbm_compat -lcrypt -latomic
sys_mman/posix_mem_offset.c: In function ‘main’:
sys_mman/posix_mem_offset.c:21:9: error: implicit declaration of function ‘posix_mem_offset’ [-Werror=implicit-function-declaration]
   21 |         posix_mem_offset(NULL, 0, NULL, NULL, NULL);
      |         ^~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors