about gcc -o snmpdemoapp ... -lsnmp

Dear All:
 I am Clement, I meet a problem about compile demo snmp application.
 when I execute gcc -I/usr/local/include -g -c snmpdemoapp.c -o
snmpdemoapp.o
 the compile is pass , but when i execute following instructions, the error
happenning

root@localhost Learning and DEMO]# gcc -o snmpdemoapp snmpdemoapp.o -lsnmp

/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(keytools.o): In
function `generate_Ku': undefined reference to `EVP_md5'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(keytools.o): In
function `generate_Ku': undefined reference to `EVP_DigestInit'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(keytools.o): In
function `generate_Ku': undefined reference to `EVP_DigestUpdate'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(keytools.o): In
function `generate_Ku': undefined reference to `EVP_DigestFinal'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(keytools.o): In
function `generate_Ku': undefined reference to `EVP_sha1'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(keytools.o): In
function `generate_Ku': undefined reference to `EVP_DigestInit'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_decrypt': undefined reference to `DES_key_sched'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_decrypt': undefined reference to `DES_cbc_encrypt'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_decrypt': undefined reference to `AES_set_encrypt_key'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_decrypt': undefined reference to `AES_cfb128_encrypt'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_encrypt': undefined reference to `AES_set_encrypt_key'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_encrypt': undefined reference to `AES_cfb128_encrypt'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_encrypt': undefined reference to `DES_key_sched'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_encrypt': undefined reference to `DES_ncbc_encrypt'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_encrypt': undefined reference to `DES_ncbc_encrypt'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_encrypt': undefined reference to `DES_key_sched'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_encrypt': undefined reference to `DES_ncbc_encrypt'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_hash': undefined reference to `EVP_md5'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_hash': undefined reference to `SSLeay'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_hash': undefined reference to `EVP_DigestInit'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_hash': undefined reference to `EVP_DigestUpdate'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_hash': undefined reference to `SSLeay'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_hash': undefined reference to `EVP_DigestFinal'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_hash': undefined reference to `EVP_DigestFinal_ex'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_hash': undefined reference to `EVP_MD_CTX_cleanup'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_hash': undefined reference to `EVP_MD_CTX_init'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_hash': undefined reference to `EVP_DigestInit'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_hash': undefined reference to `EVP_sha1'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_generate_keyed_hash': undefined reference to `EVP_md5'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_generate_keyed_hash': undefined reference to `HMAC'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_generate_keyed_hash': undefined reference to `EVP_sha1'
/usr/lib/gcc/i386-redhat-linux/4.1.0/../../../libsnmp.a(scapi.o): In
function `sc_random': undefined reference to `RAND_bytes'
collect2: ld returned 1 exit status

I don't why , and how to fix it . Any help is highly appreciated, thank you.


Best Regards,
Clement Hsu

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