Index: uspace/lib/libc/include/sys/types.h
===================================================================
--- uspace/lib/libc/include/sys/types.h	(revision 19b28b0d344a270c38cc8a73ee3b69c0bd45b7fc)
+++ uspace/lib/libc/include/sys/types.h	(revision 9cd98796ce2b79a13dae8d49fe37ce6be500f3b8)
@@ -43,4 +43,8 @@
 typedef int mode_t;
 
+typedef volatile uint8_t ioport8_t;
+typedef volatile uint16_t ioport16_t;
+typedef volatile uint32_t ioport32_t;
+
 #endif