/opt/IBM/openxlC/17.1.1/bin/ibm-clang -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sys_mman/posix_mem_offset.c -o sys_mman/posix_mem_offset -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -latomic
sys_mman/posix_mem_offset.c:6:94: error: use of undeclared identifier 'posix_mem_offset'
int (*foo)(const void *restrict, size_t, off_t *restrict, size_t *restrict, int *restrict) = posix_mem_offset;
                                                                                             ^
1 error generated.