This link: https://community.openvpn.net/openvpn/wiki/BuildingOpenVPN-GUI provides the following instructions:

$ autoreconf -v

$ ./configure --with-crypto-includes=/c/openssl/include --with-crypto-lib=/c/openssl/lib

$ make

As I'm new to Linux and Ubuntu, I would appreciate it if someone could show me the corresponding "sudo" commands. I understand that in Ubuntu, there's no such thing as a C: drive.

Thanks in advance.

----update----
Thank you guys for your help and suggestions. I know now that I don't need to sudo to issue the above commands.

I'd appreciate it if someone could explain to me what the "c" in "/c/openssl/include" and "/c/openssl/lib" stand for? Does "c" in those statements stand for the C: drive or C compiler?