--- seamonkey-2.39/mozilla/media/libav/libavutil/cpu.c.orig
+++ seamonkey-2.39/mozilla/media/libav/libavutil/cpu.c
@@ -36,7 +36,7 @@
 #include <sys/param.h>
 #endif
 #include <sys/types.h>
-#include <sys/sysctl.h>
+#include <linux/sysctl.h>
 #endif
 #if HAVE_SYSCONF
 #include <unistd.h>