https://github.com/BohemiaInteractive/CWR

this is the 2001 game formerly known as Operation Flashpoint: Cold War Crisis. It just had launched a remastered release to celebrate its 25th anniversary.

(Actually not sure if this tree can compile a binary to work with the original armacwa/opf data yet, but i'm sure a fork and a lot of elbowgrease into a portable SDL form can lead back)