diff --git a/include/re_sys.h b/include/re_sys.h
new file mode 100644
index 0000000..598e35c
--- /dev/null
+++ b/include/re_sys.h
@@ -0,0 +1,73 @@
+/**
+ * @file re_sys.h  Interface to system module
+ *
+ * Copyright (C) 2010 Creytiv.com
+ */
+
+
+#ifndef VERSION
+#define VERSION "?"
+#endif
+
+/**
+ * @def ARCH
+ *
+ * Architecture
+ */
+#ifndef ARCH
+#define ARCH "?"
+#endif
+
+/**
+ * @def OS
+ *
+ * Operating System
+ */
+#ifndef OS
+#ifdef WIN32
+#define OS "win32"
+#else
+#define OS "?"
+#endif
+#endif
+
+struct re_printf;
+int  sys_rel_get(uint32_t *rel, uint32_t *maj, uint32_t *min,
+		 uint32_t *patch);
+int  sys_kernel_get(struct re_printf *pf, void *unused);
+int  sys_build_get(struct re_printf *pf, void *unused);
+const char *sys_arch_get(void);
+const char *sys_os_get(void);
+const char *sys_libre_version_get(void);
+const char *sys_username(void);
+int sys_coredump_set(bool enable);
+int sys_daemon(void);
+void sys_usleep(unsigned int us);
+
+static inline void sys_msleep(unsigned int ms)
+{
+	sys_usleep(ms * 1000);
+}
+
+
+uint16_t sys_htols(uint16_t v);
+uint32_t sys_htoll(uint32_t v);
+uint16_t sys_ltohs(uint16_t v);
+uint32_t sys_ltohl(uint32_t v);
+uint64_t sys_htonll(uint64_t v);
+uint64_t sys_ntohll(uint64_t v);
+
+
+/* Random */
+void     rand_init(void);
+uint16_t rand_u16(void);
+uint32_t rand_u32(void);
+uint64_t rand_u64(void);
+char     rand_char(void);
+void     rand_str(char *str, size_t size);
+void     rand_bytes(uint8_t *p, size_t size);
+
+
+/* File-System */
+int  fs_mkdir(const char *path, uint16_t mode);
+int  fs_gethome(char *path, size_t sz);