knolleary/pubsubclient — comment on commit e4fdabf4db963f28e0701c641a823731b2cf3c13
File:  line 0
By knolleary:

EthernetClient.h exists in beta4 under arduino-1.0-beta4/libraries/Ethernet/EthernetClient.h - check you've got that. If you have, check you're actually running beta4 and not an earlier one you may installed (that's caught me out before). Whilst you're at it, 1.0-RC2 is now available - http://code.google.com/p/arduino/wiki/Arduino1