why do I get this error message ? Has anyone got this message with your lwip port . I dont find the SIOCSIFADDR string anywhere in the lwip or contrib directory . I do see this in the /usr/include/bits/ioctls.h which is the host linux x86 pc I am using for cross compiling for my ARM device. What I do is I change the /usr/include dir to usr/notincludedforarm . Inorder that these system include files are not included for the ARM compilation. But still get the same error message on executing this ARM simhost executable on my ARM device.