clang -O2  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations pthread/PTHREAD_SCOPE_SYSTEM.c -o pthread/PTHREAD_SCOPE_SYSTEM -D_POSIX_C_SOURCE=202405L  -lm  -lintl
pthread/PTHREAD_SCOPE_SYSTEM.c:2:10: fatal error: 'pthread.h' file not found
#include <pthread.h>
         ^
1 error generated.