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 ff685c93ca4666ba47a3b747bd9da4268cc5aa47)
@@ -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