Hallo, Amos, Du meintest am 19.04.11: >>>>>> Icmp4.cc:116: error: invalid use of undefined type `struct >>>>>> icmphdr' Icmp4.cc:96: error: forward declaration of `struct >>>>>> icmphdr' >> "struct icmphdr" should be defined in one of the netinet/ files. We >> need to start with figuring out which. [...] > Ohh, Just noticed you said the compiler was GCC 3.3.5. Maybe that's a compiler version problem. "cc" used gcc-3.3.5, I used (successfully) gcc-4.5.2 Viele Gruesse! Helmut
