+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <sys/wait.h>
+#ifdef HAVE_SYS_TIME_H
+# include <sys/time.h> /* For timersub */
+#endif
+#include <sys/resource.h>
+#ifdef HAVE_SYS_SELECT_H
+# include <sys/select.h>
+#endif
+#ifdef HAVE_SYS_BSDTTY_H
+# include <sys/bsdtty.h>
+#endif
+#include <sys/param.h> /* For MAXPATHLEN and roundup() */
+#ifdef HAVE_SYS_UN_H
+# include <sys/un.h> /* For sockaddr_un */
+#endif
+#ifdef HAVE_STDINT_H
+# include <stdint.h>
+#endif
+#ifdef HAVE_SYS_BITYPES_H
+# include <sys/bitypes.h> /* For u_intXX_t */
+#endif
+#ifdef HAVE_SYS_CDEFS_H
+# include <sys/cdefs.h> /* For __P() */
+#endif
+#ifdef HAVE_SYS_STAT_H
+# include <sys/stat.h> /* For S_* constants and macros */
+#endif
+#ifdef HAVE_SYS_SYSMACROS_H
+# include <sys/sysmacros.h> /* For MIN, MAX, etc */
+#endif
+#ifdef HAVE_SYS_MMAN_H
+#include <sys/mman.h> /* for MAP_ANONYMOUS */
+#endif
+
+#include <netinet/in_systm.h> /* For typedefs */
+#include <netinet/in.h> /* For IPv6 macros */
+#include <netinet/ip.h> /* For IPTOS macros */
+#include <netinet/tcp.h>
+#include <arpa/inet.h>
+#ifdef HAVE_RPC_TYPES_H
+# include <rpc/types.h> /* For INADDR_LOOPBACK */
+#endif
+#ifdef USE_PAM
+# include <security/pam_appl.h>
+#endif
+#ifdef HAVE_READPASSPHRASE_H
+# include <readpassphrase.h>
+#endif
+
+#ifdef HAVE_IA_H
+# include <ia.h>
+#endif