Julius: an open source re-implementation of Caesar III 

https://github.com/bvschaik/julius

You need the original installation data from Caesar3 ISO/CD 
Which is installed (through Wine) and the Game directory copied 
over to NetBSD 

Howto build: 

copy over either the julius.tar tarball or the julius directory to your pkgsrc 
# make install 

Game is launched as follows 

$ julius /path/to/game/datadir