Added a static library

makefile

@@ -3,20 +3,22 @@
 # See copying.txt for legal information.
 
 CFLAGS  += -std=c99 -Os -Wall -s -fpic
-
 # Add extension when compiling for Windows
 ifdef SystemRoot
 	CC  = gcc 
 	EXT = .exe
+        LIBEXT = .dll
 	RM  = del
+else
+	LIBEXT = .so
 endif
 
 # Comment this line to suppress detailed decompression information on stdout
-#DEFINES += -DEXTRA_OUT
+DEFINES += -DEXTRA_OUT
 # Uncomment this line to enable debug output
-#DEFINES += -DDEBUG_OUT
+DEFINES += -DDEBUG_OUT
 
-all: inhal$(EXT) exhal$(EXT)
+all: inhal$(EXT) exhal$(EXT) libexhal$(LIBEXT) libexhal.a
 
 clean:
 	$(RM) inhal$(EXT) exhal$(EXT) compress.o libexhal.so
@@ -30,13 +32,15 @@ exhal$(EXT): exhal.c compress.o
 compress.o: compress.c
 	$(CC) $(DEFINES) $(CFLAGS) -c compress.c
 
-libexhal.so: compress.o
+libexhal$(LIBEXT): compress.o
 	gcc -shared -o $@ $^
-
+libexhal.a: compress.o
+	ar rcs $@ $^
 install: all libexhal.so
 	mkdir -pv /usr/local/bin
 	cp inhal$(EXT) exhal$(EXT) /usr/local/bin
 	mkdir -pv /usr/local/lib
-	cp libexhal.so /usr/local/lib
+	cp libexhal$(LIBEXT) /usr/local/lib
+	cp libexhal.a /usr/local/lib
 	mkdir -pv /usr/local/include
 	cp include/* /usr/local/include