cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations ftw/S_TYPEISSHM.c -o ftw/S_TYPEISSHM -D_POSIX_C_SOURCE=202405L -lm -lpthread -lnetwork -lbsd -latomic
ftw/S_TYPEISSHM.c:9:2: error: #error "S_TYPEISSHM is not defined"
    9 | #error "S_TYPEISSHM is not defined"
      |  ^~~~~