diff -Naur bzip2-1.0.6/Makefile bzip2-1.0.6-p/Makefile
--- bzip2-1.0.6/Makefile	2010-09-11 00:46:02.000000000 +0200
+++ bzip2-1.0.6-p/Makefile	2016-10-23 13:20:13.253751080 +0200
@@ -15,16 +15,16 @@
 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 $(BIGFILES)
 
 # Where you want it installed when you do 'make install'
-PREFIX=/usr/local
+PREFIX=/usr
 
 
 OBJS= blocksort.o  \
diff -Naur bzip2-1.0.6/Makefile-libbz2_so bzip2-1.0.6-p/Makefile-libbz2_so
--- bzip2-1.0.6/Makefile-libbz2_so	2010-09-11 01:07:52.000000000 +0200
+++ bzip2-1.0.6-p/Makefile-libbz2_so	2016-10-23 13:20:55.567751708 +0200
@@ -22,9 +22,10 @@
 
 
 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)
+LDFLAGS+=
 
 OBJS= blocksort.o  \
       huffman.o    \