--- bzip2-1.0.8.orig/Makefile-libbz2_so	2019-07-13 19:50:05.000000000 +0200
+++ bzip2-1.0.8/Makefile-libbz2_so	2020-04-02 00:16:39.699887764 +0200
@@ -21,10 +21,11 @@
 # ------------------------------------------------------------------
 
 
-SHELL=/bin/sh
-CC=gcc
+SHELL?=/bin/sh
+CC?=gcc
 BIGFILES=-D_FILE_OFFSET_BITS=64
-CFLAGS=-fpic -fPIC -Wall -Winline -O2 -g $(BIGFILES)
+CFLAGS?=
+CFLAGS+=-fpic -fPIC -Wall -Winline -g $(BIGFILES)
 
 OBJS= blocksort.o  \
       huffman.o    \