--- a/bzip2.c
+++ b/bzip2.c
@@ -54,7 +54,7 @@
 #include <math.h>
 #include <errno.h>
 #include <ctype.h>
-#include "bzlib.h"
+#include <bzlib.h>
 
 #define ERROR_IF_EOF(i)       { if ((i) == EOF)  ioError(); }
 #define ERROR_IF_NOT_ZERO(i)  { if ((i) != 0)    ioError(); }
--- a/bzlib_private.h
+++ b/bzlib_private.h
@@ -30,7 +30,7 @@
 #include <string.h>
 #endif
 
-#include "bzlib.h"
+#include <bzlib.h>
 
 
 
--- a/Makefile
+++ b/Makefile
@@ -21,11 +21,38 @@ RANLIB=ranlib
 LDFLAGS=
 
 BIGFILES=-D_FILE_OFFSET_BITS=64
-CFLAGS=-Wall -Winline -O2 -g $(BIGFILES)
+CFLAGS_COMMON=-Wall -Winline -O2 -g $(BIGFILES) -I.
+CFLAGS_NOPIC=$(filter-out -O%,$(CFLAGS)) $(CFLAGS_COMMON)
+CFLAGS_PIC=$(filter-out -O%,$(CFLAGS)) -fpic -fPIC $(CFLAGS_COMMON)
 
 # Where you want it installed when you do 'make install'
-PREFIX=/usr/local
-
+PREFIX?=/usr/local
+ENABLE_BIN_STATIC?=1
+ENABLE_BIN_SHARED?=1
+ENABLE_LIB_STATIC?=1
+ENABLE_LIB_SHARED?=1
+ENABLE_DEV?=1
+ENABLE_DOCS?=1
+ENABLE_TESTS?=1
+
+ifeq ($(ENABLE_BIN_STATIC),1)
+  ENABLE_BIN=1
+  ifneq ($(ENABLE_LIB_STATIC),1)
+    ENABLE_LIB_STATIC=1
+  endif
+endif
+ifeq ($(ENABLE_BIN_SHARED),1)
+  ENABLE_BIN=1
+  ifneq ($(ENABLE_LIB_SHARED),1)
+    ENABLE_LIB_STATIC=1
+  endif
+endif
+ifeq ($(ENABLE_LIB_STATIC),1)
+  ENABLE_LIB=1
+endif
+ifeq ($(ENABLE_LIB_SHARED),1)
+  ENABLE_LIB=1
+endif
 
 OBJS= blocksort.o  \
       huffman.o    \
@@ -35,15 +62,38 @@ OBJS= blocksort.o  \
       decompress.o \
       bzlib.o
 
-all: libbz2.a bzip2 bzip2recover test
-
-bzip2: libbz2.a bzip2.o
-	$(CC) $(CFLAGS) $(LDFLAGS) -o bzip2 bzip2.o -L. -lbz2
+TGTS_all:=
+TGTS_bzip2:=bzip2.o
+TGTS_check:=
+TGTS_install:=
+ifeq ($(ENABLE_LIB),1)
+  TGTS_all+=libbz2
+  TGTS_bzip2+=libbz2
+endif
+ifeq ($(ENABLE_BIN),1)
+  TGTS_all+=bzip2 bzip2recover
+  TGTS_install+=bzip2 bzip2recover
+endif
+ifeq ($(ENABLE_TESTS),1)
+  TGTS_all+=test
+  TGTS_check+=test
+endif
+ 
+all: $(TGTS_all)
+
+bzip2: $(TGTS_bzip2)
+ifeq ($(ENABLE_BIN_STATIC),1)
+	$(CC) $(CFLAGS_NOPIC) $(LDFLAGS) -o bzip2 bzip2.o -L. -lbz2
+endif
+ifeq ($(ENABLE_BIN_SHARED),1)
+	$(CC) $(CFLAGS_PIC) -o bzip2-shared bzip2.o libbz2.so.1.0
+endif
 
 bzip2recover: bzip2recover.o
-	$(CC) $(CFLAGS) $(LDFLAGS) -o bzip2recover bzip2recover.o
+	$(CC) $(CFLAGS_NOPIC) $(LDFLAGS) -o bzip2recover bzip2recover.o
 
-libbz2.a: $(OBJS)
+libbz2: $(OBJS)
+ifeq ($(ENABLE_LIB_STATIC),1)
 	rm -f libbz2.a
 	$(AR) cq libbz2.a $(OBJS)
 	@if ( test -f $(RANLIB) -o -f /usr/bin/ranlib -o \
@@ -51,8 +101,18 @@ libbz2.a: $(OBJS)
 		echo $(RANLIB) libbz2.a ; \
 		$(RANLIB) libbz2.a ; \
 	fi
+endif
+ifeq ($(ENABLE_LIB_SHARED),1)
+	$(CC) -shared -Wl,-soname -Wl,libbz2.so.1.0 $(LDFLAGS) -o libbz2.so.1.0.8 $(OBJS)
+	rm -f libbz2.so.1.0
+	rm -f libbz2.so.1
+	rm -f libbz2.so
+	ln -s libbz2.so.1.0.8 libbz2.so.1.0
+	ln -s libbz2.so.1.0 libbz2.so.1
+	ln -s libbz2.so.1 libbz2.so
+endif
 
-check: test
+check: $(TGTS_check)
 test: bzip2
 	@cat words1
 	./bzip2 -1  < sample1.ref > sample1.rb2
@@ -69,69 +129,153 @@ test: bzip2
 	cmp sample3.tst sample3.ref
 	@cat words3
 
-install: bzip2 bzip2recover
+install: $(TGTS_install)
+ifeq ($(ENABLE_BIN),1)
 	if ( test ! -d $(PREFIX)/bin ) ; then mkdir -p $(PREFIX)/bin ; fi
+endif
+ifeq ($(ENABLE_LIB),1)
 	if ( test ! -d $(PREFIX)/lib ) ; then mkdir -p $(PREFIX)/lib ; fi
+endif
+ifeq ($(ENABLE_DEV),1)
+	if ( test ! -d $(PREFIX)/include ) ; then mkdir -p $(PREFIX)/include ; fi
+endif
+ifeq ($(ENABLE_DOCS),1)
 	if ( test ! -d $(PREFIX)/man ) ; then mkdir -p $(PREFIX)/man ; fi
 	if ( test ! -d $(PREFIX)/man/man1 ) ; then mkdir -p $(PREFIX)/man/man1 ; fi
-	if ( test ! -d $(PREFIX)/include ) ; then mkdir -p $(PREFIX)/include ; fi
+endif
+ifeq ($(ENABLE_BIN),1)
+  ifeq ($(ENABLE_BIN_STATIC),1)
 	cp -f bzip2 $(PREFIX)/bin/bzip2
-	cp -f bzip2 $(PREFIX)/bin/bunzip2
-	cp -f bzip2 $(PREFIX)/bin/bzcat
+	chmod a+rx $(PREFIX)/bin/bzip2
+  endif
+  ifeq ($(ENABLE_BIN_SHARED),1)
+    ifeq ($(ENABLE_BIN_STATIC),1)
+	cp -f bzip2-shared $(PREFIX)/bin/bzip2-shared
+	chmod a+rx $(PREFIX)/bin/bzip2-shared
+    else
+	cp -f bzip2-shared $(PREFIX)/bin/bzip2
+    endif
+  endif
+	rm -f $(PREFIX)/bin/bunzip2
+	rm -f $(PREFIX)/bin/bzcat
+	( cd $(PREFIX)/bin && ln -s bzip2 bunzip2 )
+	( cd $(PREFIX)/bin && ln -s bzip2 bzcat )
+	rm -f $(PREFIX)/bin/bunzip2-shared
+	rm -f $(PREFIX)/bin/bzcat-shared
+  ifeq ($(ENABLE_BIN_SHARED),1)
+    ifeq ($(ENABLE_BIN_STATIC),1)
+	( cd $(PREFIX)/bin && ln -s bzip2-shared bunzip2-shared )
+	( cd $(PREFIX)/bin && ln -s bzip2-shared bzcat-shared )
+    endif
+  endif
 	cp -f bzip2recover $(PREFIX)/bin/bzip2recover
-	chmod a+x $(PREFIX)/bin/bzip2
-	chmod a+x $(PREFIX)/bin/bunzip2
-	chmod a+x $(PREFIX)/bin/bzcat
-	chmod a+x $(PREFIX)/bin/bzip2recover
-	cp -f bzip2.1 $(PREFIX)/man/man1
-	chmod a+r $(PREFIX)/man/man1/bzip2.1
-	cp -f bzlib.h $(PREFIX)/include
-	chmod a+r $(PREFIX)/include/bzlib.h
-	cp -f libbz2.a $(PREFIX)/lib
-	chmod a+r $(PREFIX)/lib/libbz2.a
+	chmod a+rx $(PREFIX)/bin/bzip2recover
 	cp -f bzgrep $(PREFIX)/bin/bzgrep
-	ln -s -f $(PREFIX)/bin/bzgrep $(PREFIX)/bin/bzegrep
-	ln -s -f $(PREFIX)/bin/bzgrep $(PREFIX)/bin/bzfgrep
-	chmod a+x $(PREFIX)/bin/bzgrep
+	chmod a+rx $(PREFIX)/bin/bzgrep
+	rm -f $(PREFIX)/bin/bzegrep
+	rm -f $(PREFIX)/bin/bzfgrep
+	( cd $(PREFIX)/bin && ln -s bzgrep bzegrep )
+	( cd $(PREFIX)/bin && ln -s bzgrep bzfgrep )
 	cp -f bzmore $(PREFIX)/bin/bzmore
-	ln -s -f $(PREFIX)/bin/bzmore $(PREFIX)/bin/bzless
-	chmod a+x $(PREFIX)/bin/bzmore
+	chmod a+rx $(PREFIX)/bin/bzmore
+	rm -f $(PREFIX)/bin/bzless
+	( cd $(PREFIX)/bin && ln -s bzmore bzless )
+	rm -f $(PREFIX)/bin/bzcmp
 	cp -f bzdiff $(PREFIX)/bin/bzdiff
-	ln -s -f $(PREFIX)/bin/bzdiff $(PREFIX)/bin/bzcmp
-	chmod a+x $(PREFIX)/bin/bzdiff
-	cp -f bzgrep.1 bzmore.1 bzdiff.1 $(PREFIX)/man/man1
-	chmod a+r $(PREFIX)/man/man1/bzgrep.1
-	chmod a+r $(PREFIX)/man/man1/bzmore.1
-	chmod a+r $(PREFIX)/man/man1/bzdiff.1
+	chmod a+rx $(PREFIX)/bin/bzdiff
+	( cd $(PREFIX)/bin && ln -s bzdiff bzcmp )
+endif
+ifeq ($(ENABLE_DEV),1)
+	cp -f bzlib.h $(PREFIX)/include
+	chmod a+r $(PREFIX)/include/bzlib.h
+endif
+ifeq ($(ENABLE_DOCS),1)
+	cp -f bzip2.1 bzgrep.1 bzmore.1 bzdiff.1 $(PREFIX)/man/man1
 	echo ".so man1/bzgrep.1" > $(PREFIX)/man/man1/bzegrep.1
 	echo ".so man1/bzgrep.1" > $(PREFIX)/man/man1/bzfgrep.1
 	echo ".so man1/bzmore.1" > $(PREFIX)/man/man1/bzless.1
 	echo ".so man1/bzdiff.1" > $(PREFIX)/man/man1/bzcmp.1
+	chmod a+r $(PREFIX)/man/man1/bzip2.1
+	chmod a+r $(PREFIX)/man/man1/bzgrep.1
+	chmod a+r $(PREFIX)/man/man1/bzmore.1
+	chmod a+r $(PREFIX)/man/man1/bzdiff.1
+	chmod a+r $(PREFIX)/man/man1/bzegrep.1
+	chmod a+r $(PREFIX)/man/man1/bzfgrep.1
+	chmod a+r $(PREFIX)/man/man1/bzless.1
+	chmod a+r $(PREFIX)/man/man1/bzcmp.1
+endif
+ifeq ($(ENABLE_LIB_SHARED),1)
+	cp -f libbz2.so.1.0.8 $(PREFIX)/lib
+	chmod a+r $(PREFIX)/lib/libbz2.so.1.0.8
+	rm -f $(PREFIX)/lib/libbz2.so.1.0
+	rm -f $(PREFIX)/lib/libbz2.so.1
+	rm -f $(PREFIX)/lib/libbz2.so
+	( cd $(PREFIX)/lib && ln -s libbz2.so.1.0.8 libbz2.so.1.0 )
+	( cd $(PREFIX)/lib && ln -s libbz2.so.1.0 libbz2.so.1 )
+	( cd $(PREFIX)/lib && ln -s libbz2.so.1 libbz2.so )
+endif
+ifeq ($(ENABLE_LIB_STATIC),1)
+	cp -f libbz2.a $(PREFIX)/lib
+	chmod a+r $(PREFIX)/lib/libbz2.a
+endif
+
+uninstall:
+	rm -f $(PREFIX)/bin/bzip2
+	rm -f $(PREFIX)/bin/bzip2-shared
+	rm -f $(PREFIX)/bin/bunzip2
+	rm -f $(PREFIX)/bin/bzcat
+	rm -f $(PREFIX)/bin/bunzip2-shared
+	rm -f $(PREFIX)/bin/bzcat-shared
+	rm -f $(PREFIX)/bin/bzip2recover
+	rm -f $(PREFIX)/bin/bzgrep
+	rm -f $(PREFIX)/bin/bzegrep
+	rm -f $(PREFIX)/bin/bzfgrep
+	rm -f $(PREFIX)/bin/bzmore
+	rm -f $(PREFIX)/bin/bzless
+	rm -f $(PREFIX)/bin/bzdiff
+	rm -f $(PREFIX)/bin/bzcmp
+	rm -f $(PREFIX)/include/bzlib.h
+	rm -f $(PREFIX)/lib/libbz2.so.1.0.8
+	rm -f $(PREFIX)/lib/libbz2.so.1.0
+	rm -f $(PREFIX)/lib/libbz2.so.1
+	rm -f $(PREFIX)/lib/libbz2.so
+	rm -f $(PREFIX)/lib/libbz2.a
+	rm -f $(PREFIX)/man/man1/bzip2.1
+	rm -f $(PREFIX)/man/man1/bzgrep.1
+	rm -f $(PREFIX)/man/man1/bzmore.1
+	rm -f $(PREFIX)/man/man1/bzdiff.1
+	rm -f $(PREFIX)/man/man1/bzegrep.1
+	rm -f $(PREFIX)/man/man1/bzfgrep.1
+	rm -f $(PREFIX)/man/man1/bzless.1
+	rm -f $(PREFIX)/man/man1/bzcmp.1
+	(rmdir $(PREFIX)/bin $(PREFIX)/include $(PREFIX)/lib $(PREFIX)/man/man1 $(PREFIX)/man || true ) 2> /dev/null
 
 clean: 
-	rm -f *.o libbz2.a bzip2 bzip2recover \
+	rm -f $(OBJS) bzip2.o \
+	libbz2.so.1.0.8 libbz2.so.1.0 libbz2.so.1 libbz2.so \
+	libbz2.a bzip2 bzip2-shared bzip2recover \
 	sample1.rb2 sample2.rb2 sample3.rb2 \
 	sample1.tst sample2.tst sample3.tst
 
 blocksort.o: blocksort.c
 	@cat words0
-	$(CC) $(CFLAGS) -c blocksort.c
+	$(CC) $(CFLAGS_NOPIC) -c blocksort.c
 huffman.o: huffman.c
-	$(CC) $(CFLAGS) -c huffman.c
+	$(CC) $(CFLAGS_NOPIC) -c huffman.c
 crctable.o: crctable.c
-	$(CC) $(CFLAGS) -c crctable.c
+	$(CC) $(CFLAGS_NOPIC) -c crctable.c
 randtable.o: randtable.c
-	$(CC) $(CFLAGS) -c randtable.c
+	$(CC) $(CFLAGS_NOPIC) -c randtable.c
 compress.o: compress.c
-	$(CC) $(CFLAGS) -c compress.c
+	$(CC) $(CFLAGS_NOPIC) -c compress.c
 decompress.o: decompress.c
-	$(CC) $(CFLAGS) -c decompress.c
+	$(CC) $(CFLAGS_NOPIC) -c decompress.c
 bzlib.o: bzlib.c
-	$(CC) $(CFLAGS) -c bzlib.c
+	$(CC) $(CFLAGS_NOPIC) -c bzlib.c
 bzip2.o: bzip2.c
-	$(CC) $(CFLAGS) -c bzip2.c
+	$(CC) $(CFLAGS_NOPIC) -c bzip2.c
 bzip2recover.o: bzip2recover.c
-	$(CC) $(CFLAGS) -c bzip2recover.c
+	$(CC) $(CFLAGS_NOPIC) -c bzip2recover.c
 
 
 distclean: clean
@@ -189,7 +333,6 @@ dist: check manual
 	   $(DISTNAME)/bzmore.1 \
 	   $(DISTNAME)/bzgrep \
 	   $(DISTNAME)/bzgrep.1 \
-	   $(DISTNAME)/Makefile-libbz2_so \
 	   $(DISTNAME)/bz-common.xsl \
 	   $(DISTNAME)/bz-fo.xsl \
 	   $(DISTNAME)/bz-html.xsl \
--- a/Makefile-libbz2_so
+++ b/Makefile-libbz2_so
@@ -1,59 +0,0 @@
-
-# This Makefile builds a shared version of the library, 
-# libbz2.so.1.0.8, with soname libbz2.so.1.0,
-# at least on x86-Linux (RedHat 7.2), 
-# with gcc-2.96 20000731 (Red Hat Linux 7.1 2.96-98).  
-# Please see the README file for some important info 
-# about building the library like this.
-
-# ------------------------------------------------------------------
-# This file is part of bzip2/libbzip2, a program and library for
-# lossless, block-sorting data compression.
-#
-# bzip2/libbzip2 version 1.0.8 of 13 July 2019
-# Copyright (C) 1996-2019 Julian Seward <jseward@acm.org>
-#
-# Please read the WARNING, DISCLAIMER and PATENTS sections in the 
-# README file.
-#
-# This program is released under the terms of the license contained
-# in the file LICENSE.
-# ------------------------------------------------------------------
-
-
-SHELL=/bin/sh
-CC=gcc
-BIGFILES=-D_FILE_OFFSET_BITS=64
-CFLAGS=-fpic -fPIC -Wall -Winline -O2 -g $(BIGFILES)
-
-OBJS= blocksort.o  \
-      huffman.o    \
-      crctable.o   \
-      randtable.o  \
-      compress.o   \
-      decompress.o \
-      bzlib.o
-
-all: $(OBJS)
-	$(CC) -shared -Wl,-soname -Wl,libbz2.so.1.0 -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
-
-clean: 
-	rm -f $(OBJS) bzip2.o libbz2.so.1.0.8 libbz2.so.1.0 bzip2-shared
-
-blocksort.o: blocksort.c
-	$(CC) $(CFLAGS) -c blocksort.c
-huffman.o: huffman.c
-	$(CC) $(CFLAGS) -c huffman.c
-crctable.o: crctable.c
-	$(CC) $(CFLAGS) -c crctable.c
-randtable.o: randtable.c
-	$(CC) $(CFLAGS) -c randtable.c
-compress.o: compress.c
-	$(CC) $(CFLAGS) -c compress.c
-decompress.o: decompress.c
-	$(CC) $(CFLAGS) -c decompress.c
-bzlib.o: bzlib.c
-	$(CC) $(CFLAGS) -c bzlib.c
--- a/unzcrash.c
+++ b/unzcrash.c
@@ -30,7 +30,7 @@
 
 #include <stdio.h>
 #include <assert.h>
-#include "bzlib.h"
+#include <bzlib.h>
 
 #define M_BLOCK 1000000