--- a/xine_post_autocrop.c
+++ b/xine_post_autocrop.c
@@ -42,6 +42,7 @@
  */
 
 
+#include <stddef.h>
 #include <stdint.h>
 
 #include <xine/xine_internal.h>
--- a/xine_post_swscale.c
+++ b/xine_post_swscale.c
@@ -37,6 +37,8 @@
  *    - Fixed yv12 stretched warp tables generation
  */
 
+#include <stddef.h>
+
 #include <xine/xine_internal.h>
 #include <xine/post.h>
 #include <float.h>  /* DBL_MIN */
--- a/xine_post_audiochannel.c
+++ b/xine_post_audiochannel.c
@@ -39,6 +39,8 @@
  *
  */
 
+#include <stddef.h>
+
 #include <xine/xine_internal.h>
 #include <xine/post.h>