--- /dev/null
+/* Exim: OS-specific C header file for GNU/Hurd */
+
+#define CRYPT_H
+#define GLIBC_IP_OPTIONS
+#define HAVE_BSD_GETLOADAVG
+#define HAVE_MMAP
+#define HAVE_SYS_VFS_H
+#define NO_IP_VAR_H
+#define SIG_IGN_WORKS
+#define SIOCGIFCONF_GIVES_ADDR
+
+#define F_FREESP O_TRUNC
+typedef struct flock flock_t;
+
+#define os_strsignal strsignal
+#define OS_STRSIGNAL
+
+/* Hurd-specific bits below */
+
+/* default is non-const */
+#define ICONV_ARG2_TYPE const char **
+
+/* End */