--- a/Makefile
+++ b/Makefile
@@ -8,16 +8,18 @@ AUDIO_DRV = oss_audio.o
 # CFLAGS += -DUSE_ALSA=1
 # AUDIO_DRV = wave_out.o
 
-all: pmdwin
+all: pmdwin libpmdwin.so
 %.o: %.c
 	$(CC) $(CFLAGS) -c $<
 
-%.o: %.cc
+%.o: %.cpp
 	$(CXX) $(CXXFLAGS) -c $<
 
 clean:
-	rm *.o pmdwin
+	rm -f *.o pmdwin libpmdwin.so
 
 pmdwin: pmd_play.o pmdwin.o table.o getopt.o lfg.o $(AUDIO_DRV) fmgen.o
 	$(CC) -o $@ $^
 
+libpmdwin.so: pmdwin.o table.o getopt.o lfg.o $(AUDIO_DRV) fmgen.o
+	$(CC) -shared -o $@ $^