right. I was missing several devels. Installed them and no more errors. It ends with /usr/lib64/gcc/x86_64-suse-linux/4.4/../../../../x86_64-suse-linux/bin/ld: skipping incompatible /usr/X11R6/lib/libGL.so when searching for -lGL I thought all was fine now but I can't run ./test_dbg. So maybe a missing OpenGL devel? But there are so many OpenGL related packages I can choose from. I have the following installed: Mesa, glitz, glitz-devel, gtkglext, gtkglext-devel, wxWidgets-gl,