+AH_TOP([
+#ifndef CONFIG_H
+#define CONFIG_H
+
+#ifdef _SYS_FEATURE_TESTS_H
+#error "You should include config.h as your first include file"
+#endif
+
+#ifdef WIN32
+#define _WIN32_WINNT 0x0501
+#endif
+])
+
+AH_BOTTOM([
+#ifdef HAVE_SYS_WAIT_H
+#include <sys/wait.h>
+#endif
+
+#ifdef HAVE_FNMATCH_H
+#include <fnmatch.h>
+#endif
+
+#ifdef HAVE_POLL_H
+#include <poll.h>
+#else
+#include "poll/poll.h"
+#endif
+
+/* To hide the platform differences between MS Windows and Unix, I am
+ * going to use the Microsoft way and #define the Microsoft-specific
+ * functions to the unix way. Microsoft use a separate subsystem for sockets,
+ * but Unix normally just use a filedescriptor on the same functions. It is
+ * a lot easier to map back to the unix way with macros than going the other
+ * way without side effect ;-)
+ */
+#ifdef WIN32
+#include "win32/wrappers.h"
+#define get_socket_errno() WSAGetLastError()
+#else
+#define INVALID_SOCKET -1
+#define SOCKET_ERROR -1
+#define closesocket(a) close(a)
+#define get_socket_errno() errno
+#endif
+#endif
+])
+