cc -pthread   -Wall -Wextra -Werror=implicit-function-declaration utmpx/getutxent.c -o utmpx/getutxent -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt  -lintl -liconv
utmpx/getutxent.c:5:10: fatal error: utmpx.h: No such file or directory
    5 | #include <utmpx.h>
      |          ^~~~~~~~~
compilation terminated.