--- io_linux.h_old	2006-08-28 20:45:52.000000000 +0200
+++ io_linux.h	2006-08-28 21:04:59.000000000 +0200
@@ -35,6 +35,16 @@
 #define CHRONY_IOC_READ         2U
 #define CHRONY_IOC_WRITE        4U
 
+#elif defined(__hppa__)
+#define CHRONY_IOC_NRBITS       8
+#define CHRONY_IOC_TYPEBITS     8
+#define CHRONY_IOC_SIZEBITS     14
+#define CHRONY_IOC_DIRBITS      2
+
+#define CHRONY_IOC_NONE         0U
+#define CHRONY_IOC_WRITE        2U
+#define CHRONY_IOC_READ         1U
+
 #else
 #error "I don't know the values of the _IOC_* constants for your architecture"
 #endif