Dear sir,
I read your job description carefully.
In the past I have developed a lot of custom patch version of open source such as squid, dansguardian, snort, openssl and openvpn.
I have powerful skills open source compiling in Linux(Ubuntu and CentOS).
Your job is an ideal match for my skills and experiences.
Thank you, Looking forward to hearing from you soon.
Best regards, TaeSung.