--- Makefile.orig	2026-02-10 12:32:33 UTC
+++ Makefile
@@ -15,8 +15,8 @@ SOURCES = $(CODE) $(SCRIPTS) $(DOCS) $(EXTRAS) $(TEST)
 EXTRAS  = shredtree.py shredcompare.py
 TEST    = test
 SOURCES = $(CODE) $(SCRIPTS) $(DOCS) $(EXTRAS) $(TEST) Makefile
-CFLAGS  = -O3
-LDFLAGS = 
+CFLAGS  ?= -O3
+LDFLAGS ?= 
 
 VERSION=$(shell sed -n <NEWS.adoc '/^[0-9]/s/:.*//p' | head -1)
 
@@ -40,7 +40,7 @@ main.o: main.c shred.h hash.h
 all: comparator comparator.1
 
 main.o: main.c shred.h hash.h
-	$(CC) -DVERSIONION=\"$(VERSION)\" -c $(CFLAGS) main.c 
+	$(CC) -DVERSION=\"$(VERSION)\" -c $(CFLAGS) main.c 
 linebyline.o: linebyline.c
 	$(CC) -c $(CFLAGS) linebyline.c
 hash.o: hash.c hash.h hashtab.h
