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  -liconv
unistd/fexecve.c:30:2: error: call to undeclared function 'fexecve'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   30 |         fexecve(fd, args, environ);
      |         ^
unistd/fexecve.c:30:2: note: did you mean 'execve'?
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/unistd.h:449:6: note: 'execve' declared here
  449 | int      execve(const char * __file, char *_LIBC_CSTR const *_LIBC_NULL_TERMINATED __argv, char *_LIBC_CSTR const *_LIBC_NULL_TERMINATED __envp) __WATCHOS_PROHIBITED __TVOS_PROHIBITED;
      |          ^
1 error generated.