--- a/gzip.c
+++ b/gzip.c
@@ -58,6 +58,9 @@
 
 #include "tailor.h"
 
+/* Before gzip.h: #define head collides with aarch64 struct _aarch64_ctx. */
+#include <signal.h>
+
 #include "gzip.h"
 #include "lzw.h"
 #include "revision.h"
@@ -79,7 +82,6 @@
 #include <inttypes.h>
 #include <limits.h>
 #include <locale.h>
-#include <signal.h>
 #include <stdcountof.h>
 #include <stddef.h>
 #include <stdlib.h>