cc -O2 -pthread -I/usr/local/include  -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 -lrt -L/usr/local/lib  -lintl -lcrypt
ftw/S_TYPEISSHM.c:9:2: error: #error "S_TYPEISSHM is not defined"
    9 | #error "S_TYPEISSHM is not defined"
      |  ^~~~~