--- a/CA.h	2017-03-28 11:14:07.000000000 +0200
+++ b/CA.h	2018-03-27 00:47:51.231750662 +0200
@@ -9,4 +9,12 @@
   unsigned char cw[16];
 } ca_descr_aes_t;
 
+#ifndef CA_SET_PID /* removed in kernel 4.14 */
+typedef struct ca_pid {
+        unsigned int pid;
+        int index;          /* -1 == disable */
+} ca_pid_t;
+#define CA_SET_PID _IOW('o', 135, struct ca_pid)
 #endif
+
+#endif // __CA_H