cc -O2 -pipe  -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations utmpx/struct-timeval.c -o utmpx/struct-timeval -D_POSIX_C_SOURCE=202405L  -lm -lpthread 
utmpx/struct-timeval.c:7:10: fatal error: 'utmpx.h' file not found
#include <utmpx.h>
         ^~~~~~~~~
1 error generated.