diff -Naur ktechlab-0.3.7.orig/src/electronics/port.cpp ktechlab-0.3.7/src/electronics/port.cpp
--- ktechlab-0.3.7.orig/src/electronics/port.cpp 2009-01-28 17:13:29.000000000 +0100
+++ ktechlab-0.3.7/src/electronics/port.cpp 2017-02-23 16:48:27.331987630 +0100
@@ -274,13 +274,13 @@
#define PPRELEASE 0xCAFE
#endif
-const int IOCTL_REG_READ[3] = {
+const unsigned long IOCTL_REG_READ[3] = {
PPRDATA,
PPRSTATUS,
PPRCONTROL,
};
-const int IOCTL_REG_WRITE[3] = {
+const unsigned long IOCTL_REG_WRITE[3] = {
PPWDATA,
0,
PPWCONTROL,