ShadowPath Compile error

[daheli]

ShadowPath/shadowsocks-libev/src/encrypt.h:108:5: error: unknown type name 'cipher_evp_t'
    cipher_evp_t evp;
    ^
ShadowPath/shadowsocks-libev/src/encrypt.h:112:16: error: use of undeclared identifier 'MAX_IV_LENGTH'
    uint8_t iv[MAX_IV_LENGTH];