--- a/daemons/lircd.cpp
+++ b/daemons/lircd.cpp
@@ -110,6 +110,17 @@ int clock_gettime(int clk_id, struct timespec *t){
 #endif
 #define WHITE_SPACE " \t"
 
+/* Defines removed in linux-headers-5.18:
+     https://sourceforge.net/p/lirc/git/merge-requests/45/
+ */
+#ifndef LIRC_CAN_SET_REC_FILTER
+#    define LIRC_CAN_SET_REC_FILTER 0x08000000
+#endif
+
+#ifndef LIRC_CAN_NOTIFY_DECODE
+#    define LIRC_CAN_NOTIFY_DECODE 0x01000000
+#endif
+
 static const logchannel_t logchannel = LOG_APP;
 
 /** How long we sleep while waiting for busy write sockets. */
--- a/tools/lirc-lsplugins.cpp
+++ b/tools/lirc-lsplugins.cpp
@@ -21,6 +21,12 @@
 #include "config.h"
 #include "lirc_private.h"
 
+/* Defines removed in linux-headers-5.18:
+     https://sourceforge.net/p/lirc/git/merge-requests/45/
+ */
+#ifndef LIRC_CAN_NOTIFY_DECODE
+#    define LIRC_CAN_NOTIFY_DECODE 0x01000000
+#endif
 
 #define USAGE \
 	"\nSynopsis:\n" \