Makefile to create shared library for libbz2 on MacOS

Makefile-libbz2_dylib

# This Makefile builds a shared version of the library,
# libbz2.dylib for MacOSX x86 (10.13.4 or higher),
# with gcc-2.96 20000731 (Red Hat Linux 7.1 2.96-98).
# It is a custom Makefile. Use at own risk.
# Run in your MacOS terminal with the following command:
# make -f Makefile-libbz2_dylib

PKG_VERSION?=1.0.8
PREFIX?=/usr/local

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)
	$(CC) -shared -Wl,-install_name -Wl,libbz2.dylib -o libbz2.${PKG_VERSION}.dylib $(OBJS)
	cp libbz2.${PKG_VERSION}.dylib ${PREFIX}/lib/
	ln -s libbz2.${PKG_VERSION}.dylib ${PREFIX}/lib/libbz2.dylib

clean:
	rm -f libbz2.dylib libbz2.${PKG_VERSION}.dylib

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