Ubuntu下openvpn源碼安裝
OpenVPN依賴OpenSSL庫，用於加密，需要安裝。LZO庫，數據壓縮用，不使用該庫也沒有關系。
OpenSSL的下載地址：http://www.openssl.org/
LZO的下載地址：http://www.oberhumer.com/opensource/lzo/
OpenVPN的下載地址：http://www.openvpn.net
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/
如果不帶--with-ssl-headers的話，就會出現下面的錯誤
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
如果不帶 --with-ssl-lib=/usr/local/ssl/lib/，則出現的錯誤是
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
