Andy Pevy, G4XYW informed me that the following changes were required to make OpenWebRX work on his Odroid C2:

In the Makefile:

PARAMS_NEON = -march=armv8-a+fp+simd+crc+nocrypto -mtune=cortex-a53 -fexpensive-optimizations -funsafe-math-optimizations -Wformat=0

If netcat is not installed or not available, in csdr.py, from:

any_chain_base="nc -v 127.0.0.1 {nc_port} | "

...to:

any_chain_base="ncat -v 127.0.0.1 {nc_port} | "