diff --git a/backend/wayland/wl_seat.c b/backend/wayland/wl_seat.c
index 5163e804..8fb4aa5f 100644
--- a/backend/wayland/wl_seat.c
+++ b/backend/wayland/wl_seat.c
@@ -1,4 +1,4 @@
-#define _XOPEN_SOURCE 500
+#define _POSIX_C_SOURCE 200809L
 #include <assert.h>
 #include <stdint.h>
 #include <stdlib.h>
diff --git a/examples/idle-inhibit.c b/examples/idle-inhibit.c
index 348892ab..48c812e8 100644
--- a/examples/idle-inhibit.c
+++ b/examples/idle-inhibit.c
@@ -8,7 +8,11 @@
 #include "idle-inhibit-unstable-v1-client-protocol.h"
 #include "xdg-shell-client-protocol.h"
 
+#ifdef __linux__
 #include <linux/input-event-codes.h>
+#elif __FreeBSD__
+#include <dev/evdev/input-event-codes.h>
+#endif
 
 /**
  * Usage: idle-inhibit
diff --git a/examples/layer-shell.c b/examples/layer-shell.c
index 70ae21f0..f56825c3 100644
--- a/examples/layer-shell.c
+++ b/examples/layer-shell.c
@@ -1,4 +1,4 @@
-#define _POSIX_C_SOURCE 199309L
+#define _POSIX_C_SOURCE 200112L
 #ifdef __linux__
 #include <linux/input-event-codes.h>
 #elif __FreeBSD__
diff --git a/examples/multi-pointer.c b/examples/multi-pointer.c
index 58689649..958e90f6 100644
--- a/examples/multi-pointer.c
+++ b/examples/multi-pointer.c
@@ -1,5 +1,4 @@
 #define _POSIX_C_SOURCE 200112L
-#define _XOPEN_SOURCE 500
 #include <assert.h>
 #include <GLES2/gl2.h>
 #include <math.h>
diff --git a/examples/pointer.c b/examples/pointer.c
index e0f009b3..f0d9fb4b 100644
--- a/examples/pointer.c
+++ b/examples/pointer.c
@@ -1,5 +1,4 @@
 #define _POSIX_C_SOURCE 200112L
-#define _XOPEN_SOURCE 500
 #include <assert.h>
 #include <math.h>
 #include <stdio.h>
diff --git a/examples/rotation.c b/examples/rotation.c
index 2d2fb179..add7f42f 100644
--- a/examples/rotation.c
+++ b/examples/rotation.c
@@ -1,5 +1,4 @@
 #define _POSIX_C_SOURCE 200112L
-#define _XOPEN_SOURCE 500
 #include <GLES2/gl2.h>
 #include <getopt.h>
 #include <math.h>
diff --git a/examples/tablet.c b/examples/tablet.c
index 4a27d0e1..4817db4d 100644
--- a/examples/tablet.c
+++ b/examples/tablet.c
@@ -1,5 +1,4 @@
-#define _POSIX_C_SOURCE 200112L
-#define _XOPEN_SOURCE 500
+#define _XOPEN_SOURCE 600
 #include <GLES2/gl2.h>
 #include <math.h>
 #include <stdio.h>
diff --git a/examples/touch.c b/examples/touch.c
index 9954cdbd..ba5d1e34 100644
--- a/examples/touch.c
+++ b/examples/touch.c
@@ -1,5 +1,4 @@
 #define _POSIX_C_SOURCE 200112L
-#define _XOPEN_SOURCE 500
 #include <GLES2/gl2.h>
 #include <math.h>
 #include <stdint.h>
diff --git a/rootston/seat.c b/rootston/seat.c
index 27363d8e..9010d6e3 100644
--- a/rootston/seat.c
+++ b/rootston/seat.c
@@ -1,4 +1,4 @@
-#define _POSIX_C_SOURCE 199309L
+#define _POSIX_C_SOURCE 200112L
 #include <assert.h>
 #include <libinput.h>
 #include <stdlib.h>
diff --git a/types/wlr_virtual_keyboard_v1.c b/types/wlr_virtual_keyboard_v1.c
index cf7be0ee..bd9ecf2b 100644
--- a/types/wlr_virtual_keyboard_v1.c
+++ b/types/wlr_virtual_keyboard_v1.c
@@ -1,4 +1,4 @@
-#define _POSIX_C_SOURCE 1
+#define _POSIX_C_SOURCE 199309L
 #include <assert.h>
 #include <stdlib.h>
 #include <sys/mman.h>