diff -Naur a/Makefile b/Makefile
--- a/Makefile	2026-04-10 18:13:03.378434059 -0400
+++ b/Makefile	2026-04-10 18:20:02.948754764 -0400
@@ -15,13 +15,13 @@
 SHELL=/bin/sh
 
 # To assist in cross-compiling
-CC=gcc
-AR=ar
-RANLIB=ranlib
-LDFLAGS=
+CC ?= gcc
+AR ?= ar
+RANLIB ?= ranlib
+#LDFLAGS=
 
 BIGFILES=-D_FILE_OFFSET_BITS=64
-CFLAGS=-Wall -Winline -O2 -g $(BIGFILES)
+CFLAGS+=-Wall -Winline -O2 -g $(BIGFILES)
 
 # Where you want it installed when you do 'make install'
 PREFIX=/usr/local
@@ -61,7 +61,7 @@
 	./bzip2 -d  < sample1.bz2 > sample1.tst
 	./bzip2 -d  < sample2.bz2 > sample2.tst
 	./bzip2 -ds < sample3.bz2 > sample3.tst
-	cmp sample1.bz2 sample1.rb2 
+	cmp sample1.bz2 sample1.rb2
 	cmp sample2.bz2 sample2.rb2
 	cmp sample3.bz2 sample3.rb2
 	cmp sample1.tst sample1.ref