How to use openssl in cygwin

[cxf]

Hi,all:
   I installed the Cygwin which is the Full version.
   I write the Program as the following:
   #include <openssl/evp.h>
   int  main()
   {
    EVP_MD_CTX md_ctx;
    unsigned int result_size;
    int rv;
    rv = EVP_SignInit(&md_ctx, EVP_sha1());
    return rv;
   }
  It is very simple,then I compile the program using the Cygwin(the 
file name is example.c)
   gcc -c example.c
   gcc -lcrypto -o example example.o

   but the gcc give out the error:
   undefined  reference to '_EVP_sha1'
   undefined  reference to '_EVP_DigestInit'

   I have checked that the libcrypto.a is in the right way.
   I doubt whether the libcrypto.a have the function: EVP_sha1 and 
EVP_DigestInit.

   (I compile the example.c in Linux,It is OK!)




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