#ifndef _UNISTD_H
#define _UNISTD_H
+/* On Microsoft platforms, <stdlib.h> declares 'environ'; on POSIX
+ platforms, <unistd.h> does. Every file in Emacs that includes
+ <unistd.h> also includes <stdlib.h>, so there's no need to declare
+ 'environ' here. */
+
extern ssize_t readlink (const char *, char *, size_t);
extern int symlink (char const *, char const *);
+extern int setpgid (pid_t, pid_t);
+extern pid_t getpgrp (void);
#endif /* _UNISTD_H */
-