cc -pthread   -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations pthread/PTHREAD_PRIO_PROTECT.c -o pthread/PTHREAD_PRIO_PROTECT -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt  -lintl -liconv
pthread/PTHREAD_PRIO_PROTECT.c:3:17: error: ‘PTHREAD_PRIO_PROTECT’ undeclared here (not in a function)
    3 | int const foo = PTHREAD_PRIO_PROTECT;
      |                 ^~~~~~~~~~~~~~~~~~~~