--- a/build-aux/yuck.c
+++ b/build-aux/yuck.c
@@ -65,7 +65,6 @@
 #include <sys/wait.h>
 #include <sys/stat.h>
 #include <sys/types.h>
-#include <sys/sysctl.h>
 #include <time.h>
 #if defined WITH_SCMVER
 # include <yuck-scmver.h>