How to solve the error when compiling

[MrDimension]

The error occurred during "make" process. And I got the error message below:
// ==========================================================
/u01/weidu.lww/myrocks/vio/viosslfactories.c: In function ‘new_VioSSLFd’:
/u01/weidu.lww/myrocks/vio/viosslfactories.c:266:3: warning: implicit declaration of function ‘ERR_clear_error’ [-Wimplicit-function-declaration]
ERR_clear_error();
^
/u01/weidu.lww/myrocks/vio/viosslfactories.c:307:5: error: unknown type name ‘EC_KEY’
EC_KEY ecdh = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
^
/u01/weidu.lww/myrocks/vio/viosslfactories.c:307:5: warning: implicit declaration of function ‘EC_KEY_new_by_curve_name’ [-Wimplicit-function-declaration]
/u01/weidu.lww/myrocks/vio/viosslfactories.c:307:45: error: ‘NID_X9_62_prime256v1’ undeclared (first use in this function)
EC_KEY *ecdh = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
^
/u01/weidu.lww/myrocks/vio/viosslfactories.c:307:45: note: each undeclared identifier is reported only once for each function it appears in
/u01/weidu.lww/myrocks/vio/viosslfactories.c:309:7: warning: implicit declaration of function ‘SSL_CTX_set_tmp_ecdh’ [-Wimplicit-function-declaration]
SSL_CTX_set_tmp_ecdh(ssl_fd->ssl_context, ecdh);
^
/u01/weidu.lww/myrocks/vio/viosslfactories.c:310:7: warning: implicit declaration of function ‘EC_KEY_free’ [-Wimplicit-function-declaration]
EC_KEY_free(ecdh);
^
make[2]: ** [vio/CMakeFiles/vio.dir/viosslfactories.c.o] Error 1
make[1]: *** [vio/CMakeFiles/vio.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
make: *** [all] Error 2
// ==========================================================
I found the code in vio directory is a little different from the official version of mysql 5.6. When I compile the official version of mysql 5.6, there is no error about this. After a lot of trying, I guess the reason may be about openssl. Did someone meet the same problem? What can I do to solve the problem?
(ps: my gcc version is gcc-4.9.2)