diff -Naur giflib-5.2.1/tests/makefile giflib-5.2.1_patch/tests/makefile
--- giflib-5.2.1/tests/makefile	2023-06-27 15:35:51.760833048 +0800
+++ giflib-5.2.1_patch/tests/makefile	2023-06-27 15:37:02.353759342 +0800
@@ -104,10 +104,10 @@
 
 giffix-rebuild:
 	@echo "Rebuilding giffix test."
-	@head --bytes=-20 <$(PICS)/treescap.gif | $(UTILS)/giffix 2>/dev/null | $(UTILS)/gifbuild -d >giffixed.ico
+	@busybox head -c -20 <$(PICS)/treescap.gif | $(UTILS)/giffix 2>/dev/null | $(UTILS)/gifbuild -d >giffixed.ico
 giffix-regress:
 	@echo "giffix: Testing giffix behavior"
-	@head --bytes=-20 <$(PICS)/treescap.gif | $(UTILS)/giffix 2>/dev/null | $(UTILS)/gifbuild -d | diff -u giffixed.ico -
+	@busybox head -c -20 <$(PICS)/treescap.gif | $(UTILS)/giffix 2>/dev/null | $(UTILS)/gifbuild -d | diff -u giffixed.ico -
 
 gifinto-regress:
 	@echo "gifinto: Checking behavior on short files."