When trying to (require opencv/core), I get the error:
../../usr/share/racket/collects/ffi/unsafe.rkt:255:20: ffi-obj: could not find export from foreign library
name: cvRegisterType
library: libopencv_core.so
system error: /lib64/libopencv_core.so: undefined symbol: cvRegisterType
System: Linux/OpenSuse Tumbleweed, DrRacket, OpenCV 4.0.7