example can not build

[TimChenTranzas]

I try the helloworld example, but it fails with the dudac client

-- root@vultr:~/duda-examples/001_hello_world# make [CC] main.o main.c: In function ‘_duda_main’: main.c:95:5: error: ‘router’ undeclared (first use in this function) router->map("/foo/", cb_foo); ^ main.c:95:5: note: each undeclared identifier is reported only once for each function it appears in Makefile:25: recipe for target 'main.o' failed make: *** [main.o] Error 1