+- Make sure you have the basics for compiling code, such as C compiler\r
+ (e.g., GCC) and the make package.\r
+- Also make sure you have packages installed that provide the relevant\r
+ header files for x11 (including xrandr) and opengl (e.g.,\r
+ libgl1-mesa-dev, libx11-dev and libxrandr-dev on Debian/Ubuntu).\r