I am unable to run project getting error as "error: expected parameter declarator check_compile_time(sizeof(IPHeader) == 20); ". Like these 20 errors.
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/9.0.0/include/stddef.h:120:24: note: expanded from macro 'offsetof'
#define offsetof(t, d) __builtin_offsetof(t, d)