As of Git Hash: 4a004ad, we have added several checks on C++ compiler on your system so that the transition to C++ phase go smoothly. What does this mean to you? You have to install g++ on your system if you don't have it installed on your system. To do so, you can run the following command CentOS sudo yum install gcc-c++ Debian/Ubuntu sudo apt-get install g++ For OSX you can use your clang/llvm toolchain to compile rAthena. After that, make sure you have G