Ubuntu下openvpn源码安装OpenVPN依赖OpenSSL库，用于加密，，需要安装。LZO库，数据压缩用，不使用该库也没有关系。
OpenSSL的下载地址：
LZO的下载地址：
OpenVPN的下载地址：
1、./configure –with-lzo-headers=/usr/local/include –with-lzo-lib=/usr/local/lib –with-ssl-headers=/usr/local/ssl/include/ –with-ssl-lib=/usr/local/ssl/lib/
如果不带–with-ssl-headers的话，就会出现下面的错误
configure: checking for OpenSSL Crypto Library and Header files… checking openssl/evp.h usability… no checking openssl/evp.h presence… no checking for openssl/evp.h… no configure: error: OpenSSL Crypto headers not found
如果不带 –with-ssl-lib=/usr/local/ssl/lib/，则出现的错误是
configure: checking for OpenSSL Crypto Library and Header files… checking openssl/evp.h usability… yes checking openssl/evp.h presence… yes checking for openssl/evp.h… yes checking for EVP_CIPHER_CTX_init in -lcrypto… no configure: error: OpenSSL Crypto library not found.
make ;make install
听过许多故事，见过旅行风景，就这样，
