[gSOAP] Use HTTP Digest Authentication with "undefined reference to `md5_handler'"

Hi,
I add HTTP Digest Authentication Plug-in into webserver sample code. At first , I insert the following code into Makefile
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webserver:      webserver.h webserver.c logging.o httpget.o httpform.o httpda.o threads.o options.o $(SOAPH) $(SOAPC)
                $(GSOAP) -c webserver.h
                $(CC) $(CFLAGS) -o webserver webserver.c logging.o httpget.o httpform.o httpda.o threads.o options.o soapC.c soapClient.c soapServer.c $(SOAPC) $(LIBS)
...
httpda.o:       ../../plugin/httpda.h ../../plugin/httpda.c md5evp.o
                $(CC) $(CFLAGS) -c ../../plugin/httpda.c md5evp.o
md5evp.o:       ../../plugin/md5evp.h ../../plugin/md5evp.c
                $(CC) $(CFLAGS) -c ../../plugin/md5evp.c
...
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When I 'make', it tells me
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httpda.o: In function `http_da_disconnect':
httpda.c:(.text+0x138): undefined reference to `md5_handler'
httpda.o: In function `http_da_preparerecv':
httpda.c:(.text+0x1c4): undefined reference to `md5_handler'
httpda.o: In function `http_da_preparesend':
httpda.c:(.text+0x254): undefined reference to `md5_handler'
httpda.o: In function `http_da_prepareinit':
httpda.c:(.text+0x32a): undefined reference to `md5_handler'
httpda.o: In function `http_da_calc_response':
httpda.c:(.text+0x419): undefined reference to `md5_handler'
httpda.o:httpda.c:(.text+0x440): more undefined references to `md5_handler' follow
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I can't figure out what's wrong.
Could someone tell me how to solve it? Thank you.

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