RF24Network.h:207: error: 'Serial' was not declared

[dotmpe]

I just wanted to try compiling meshping and sensornet. This error occurs in the various arduino versions (1.0.1, 1.0.4, 1.0.5) on this macbook. I already figured Timer is from maniacbug/Tictocs but with this error I'm not sure.

In file included from meshping.cpp:35:
/Users/berend/project/arduino-docs/libraries/RF24Network/RF24Network.h:207: error: 'Serial' was not declared in this scope

helloworld seems to compile fine though.