cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration unistd/fexecve.c -o unistd/fexecve -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lnetwork -lbsd -latomic
unistd/fexecve.c: In function 'main':
unistd/fexecve.c:30:9: error: implicit declaration of function 'fexecve'; did you mean 'execve'? [-Werror=implicit-function-declaration]
   30 |         fexecve(fd, args, environ);
      |         ^~~~~~~
      |         execve
cc1: some warnings being treated as errors