cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations pthread/PTHREAD_PROCESS_PRIVATE.c -o pthread/PTHREAD_PROCESS_PRIVATE -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
pthread/PTHREAD_PROCESS_PRIVATE.c:2:17: error: ‘PTHREAD_PROCESS_PRIVATE’ undeclared here (not in a function)
    2 | int const foo = PTHREAD_PROCESS_PRIVATE;
      |                 ^~~~~~~~~~~~~~~~~~~~~~~