--- Makefile-libbz2_so.orig	2019-07-17 21:09:34.798780817 +0200
+++ Makefile-libbz2_so	2019-07-17 21:09:47.306781668 +0200
@@ -22,9 +22,9 @@
 
 
 SHELL=/bin/sh
-CC=gcc
+CC ?= gcc
 BIGFILES=-D_FILE_OFFSET_BITS=64
-CFLAGS=-fpic -fPIC -Wall -Winline -O2 -g $(BIGFILES)
+CFLAGS += -fpic -fPIC -Wall -Winline $(BIGFILES)
 
 OBJS= blocksort.o  \
       huffman.o    \
@@ -35,10 +35,11 @@
       bzlib.o
 
 all: $(OBJS)
-	$(CC) -shared -Wl,-soname -Wl,libbz2.so.1.0 -o libbz2.so.1.0.8 $(OBJS)
+	$(CC) -shared -Wl,-soname -Wl,libbz2.so.1 -o libbz2.so.1.0.8 $(OBJS)
 	$(CC) $(CFLAGS) -o bzip2-shared bzip2.c libbz2.so.1.0.8
 	rm -f libbz2.so.1.0
 	ln -s libbz2.so.1.0.8 libbz2.so.1.0
+	ln -s libbz2.so.1.0.8 libbz2.so.1
 
 clean: 
 	rm -f $(OBJS) bzip2.o libbz2.so.1.0.8 libbz2.so.1.0 bzip2-shared
--- Makefile.orig	2019-07-17 21:15:28.649804898 +0200
+++ Makefile	2019-07-17 21:16:14.981808051 +0200
@@ -15,13 +15,13 @@
 SHELL=/bin/sh
 
 # To assist in cross-compiling
-CC=gcc
-AR=ar
-RANLIB=ranlib
+CC ?= gcc
+AR ?= ar
+RANLIB ?= ranlib
 LDFLAGS=
 
 BIGFILES=-D_FILE_OFFSET_BITS=64
-CFLAGS=-Wall -Winline -O2 -g $(BIGFILES)
+CFLAGS += -Wall -Winline -O2 $(BIGFILES)
 
 # Where you want it installed when you do 'make install'
 PREFIX=/usr/local