Hello David!
I stumbled upon a small bug which prevents me from compiling the ulisp arm 4.8c version. WifiClient definition needs to be moved upwards in the code. I moved lines 2549 and 2550 below line 2519 inside the #if defined(ULISP_WIFI) section.
What about adding new section for wifi client and server definitions?
#if defined(ULISP_WIFI)
WiFiClient client;
WiFiServer server(80);
#endif
Thank you,
Petr