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