/* Fake unistd.h: config.h already provides most of the relevant things. */
+#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. */
+
+/* Privide prototypes of library functions that are emulated on w32
+ and whose prototypes are usually found in unistd.h on Posix
+ platforms. */
+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);
+extern pid_t setsid (void);
+extern pid_t tcgetpgrp (int);
+
+#endif /* _UNISTD_H */