I had the same exact thing happen to me. I believe the build instructions are mildly flawed. Here's what worked for me, on Manjaro, assuming you have a toolchain, cmake, and conan installed.
```
# do conany things
conan install . --build=missing --settings=build_type=Release
# generate cmake cache using the conan stuff
cmake --preset conan-release
# build the `run` exe
cmake --build build/Release
# run the exe
build/Release/run
```