In case anyone was curious, I chased all of the pre-requisite packages down and built rtl_433 on the Pi Zero. I followed the desert-home instructions, but grabbed rtl-sdr and rtl_433 from their source git repositories and not what he bundled.
Here's a clip of the output from running rtl_433. Note that I have an Acu-Rite tower sensor and 5-in-1, and it found both. The 127% humidity on the tower sensor is because Acu-Rite left the humidity probe out of this particular part number and the warm temperature is because it's indoors:
Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner
Exact sample rate is: 250000.000414 Hz
[R82XX] PLL not locked!
Sample rate set to 250000.
Bit detection level set to 8000.
Tuner gain set to Auto.
Reading samples in async mode...
Tuned to 433920000 Hz.
2015-12-05 15:42:00 Acurite tower sensor 0x219F Ch A: 20.8 C 69.4 F 127 % RH
2015-12-05 15:42:00 Acurite tower sensor 0x219F Ch A: 20.8 C 69.4 F 127 % RH
2015-12-05 15:42:00 Acurite tower sensor 0x219F Ch A: 20.8 C 69.4 F 127 % RH
2015-12-05 15:42:00 Acurite 5n1 sensor 0x04C3 Ch C, Msg 38, Wind 0 kmph / 0.0 mph, 9.8 C 49.6 F 50 % RH
2015-12-05 15:42:00 Acurite 5n1 sensor 0x04C3 Ch C, Msg 38, Wind 0 kmph / 0.0 mph, 9.8 C 49.6 F 50 % RH
2015-12-05 15:42:00 Acurite 5n1 sensor 0x04C3 Ch C, Msg 38, Wind 0 kmph / 0.0 mph, 9.8 C 49.6 F 50 % RH
2015-12-05 15:42:16 Acurite tower sensor 0x219F Ch A: 20.8 C 69.4 F 127 % RH
2015-12-05 15:42:16 Acurite tower sensor 0x219F Ch A: 20.8 C 69.4 F 127 % RH
2015-12-05 15:42:16 Acurite tower sensor 0x219F Ch A: 20.8 C 69.4 F 127 % RH
2015-12-05 15:42:19 Acurite 5n1 sensor 0x04C3 Ch C, Total rain fall since last reset: 0.00
2015-12-05 15:42:19 Acurite 5n1 sensor 0x04C3 Ch C, Msg 31, Wind 0 kmph / 0.0 mph 90.0° E (10), rain gauge 0.00 in.
2015-12-05 15:42:19 Acurite 5n1 sensor 0x04C3 Ch C, Total rain fall since last reset: 0.00
2015-12-05 15:42:19 Acurite 5n1 sensor 0x04C3 Ch C, Msg 31, Wind 0 kmph / 0.0 mph 90.0° E (10), rain gauge 0.00 in.
2015-12-05 15:42:19 Acurite 5n1 sensor 0x04C3 Ch C, Total rain fall since last reset: 0.00
2015-12-05 15:42:19 Acurite 5n1 sensor 0x04C3 Ch C, Msg 31, Wind 0 kmph / 0.0 mph 90.0° E (10), rain gauge 0.00 in.
2015-12-05 15:42:32 Acurite tower sensor 0x219F Ch A: 20.8 C 69.4 F 127 % RH
2015-12-05 15:42:32 Acurite tower sensor 0x219F Ch A: 20.8 C 69.4 F 127 % RH
2015-12-05 15:42:32 Acurite tower sensor 0x219F Ch A: 20.8 C 69.4 F 127 % RH
2015-12-05 15:42:38 Acurite 5n1 sensor 0x04C3 Ch C, Msg 38, Wind 0 kmph / 0.0 mph, 9.8 C 49.6 F 50 % RH
2015-12-05 15:42:38 Acurite 5n1 sensor 0x04C3 Ch C, Msg 38, Wind 0 kmph / 0.0 mph, 9.8 C 49.6 F 50 % RH
2015-12-05 15:42:38 Acurite 5n1 sensor 0x04C3 Ch C, Msg 38, Wind 0 kmph / 0.0 mph, 9.8 C 49.6 F 50 % RH
2015-12-05 15:42:48 Acurite tower sensor 0x219F Ch A: 20.8 C 69.4 F 127 % RH
2015-12-05 15:42:48 Acurite tower sensor 0x219F Ch A: 20.8 C 69.4 F 127 % RH
2015-12-05 15:42:48 Acurite tower sensor 0x219F Ch A: 20.8 C 69.4 F 127 % RH
2015-12-05 15:42:57 Acurite 5n1 sensor 0x04C3 Ch C, Total rain fall since last reset: 0.00
2015-12-05 15:42:57 Acurite 5n1 sensor 0x04C3 Ch C, Msg 31, Wind 0 kmph / 0.0 mph 90.0° E (10), rain gauge 0.00 in.
2015-12-05 15:42:57 Acurite 5n1 sensor 0x04C3 Ch C, Total rain fall since last reset: 0.00
2015-12-05 15:42:57 Acurite 5n1 sensor 0x04C3 Ch C, Msg 31, Wind 0 kmph / 0.0 mph 90.0° E (10), rain gauge 0.00 in.
2015-12-05 15:42:57 Acurite 5n1 sensor 0x04C3 Ch C, Total rain fall since last reset: 0.00
2015-12-05 15:42:57 Acurite 5n1 sensor 0x04C3 Ch C, Msg 31, Wind 0 kmph / 0.0 mph 90.0° E (10), rain gauge 0.00 in.
Here's the list of recognized protocols/devices from my build:
Registering protocol "Silvercrest Remote Control"
Registering protocol "Rubicson Temperature Sensor"
Registering protocol "Prologue Temperature Sensor"
Registering protocol "Waveman Switch Transmitter"
Registering protocol "Steffen Switch Transmitter"
Registering protocol "ELV EM 1000"
Registering protocol "ELV WS 2000"
Registering protocol "LaCrosse TX Temperature / Humidity Sensor"
Registering protocol "Acurite 5n1 Weather Station"
Registering protocol "Acurite 896 Rain Gauge"
Registering protocol "Acurite Temperature and Humidity Sensor"
Registering protocol "Oregon Scientific Weather Sensor"
Registering protocol "Mebus 433"
Registering protocol "Intertechno 433"
Registering protocol "KlikAanKlikUit Wireless Switch"
Registering protocol "AlectoV1 Weather Sensor (Alecto WS3500 WS4500 Ventus W155/W044 Oregon)"
Registering protocol "Cardin S466-TX2"
Registering protocol "Fine Offset Electronics, WH-2 Sensor"
Registering protocol "Nexus Temperature & Humidity Sensor"
Registering protocol "Ambient Weather Temperature Sensor"
Registering protocol "Calibeur RF-104 Sensor"
Registering protocol "X10 RF"
Registering protocol "DSC Security Contact"
Registering protocol "Brennstuhl RCS 2044"
Registering protocol "GT-WT-02 Sensor"
Registering protocol "Danfoss CFR Thermostat"
Registering protocol "Energy Count 3000 (868.3 MHz)"
Registering protocol "Valeo Car Key"
Registering protocol "Chuango Security Technology"
Registering protocol "Generic Remote SC226x EV1527"
Registering protocol "TFA-Twin-Plus-30.3049"
Registering protocol "Digitech XC0348 Weather Station"
Registering protocol "WT450"
Registering protocol "LaCrosse WS-2310 Weather Station"
Registering protocol "Esperanza EWS"
Registering protocol "Efergy e2 classic"
Registering protocol "Inovalley kw9015b rain and Temperature weather station"
Registering protocol "Generic temperature sensor 1"
Registering protocol "Acurite 592TXR Temperature/Humidity Sensor and 5n1 Weather Station"
Registering protocol "Acurite 986 Refrigerator / Freezer Thermometer"
No Davis support, but there is support for several other weather station vendors besides Acu-Rite.....