make build fails

[borisreitman]

I have followed instructions in the README and ran make build. I get this error:

make build
GOOS=js GOARCH=wasm tinygo build -target wasm -no-debug -o main.wasm
tinygo:wasm-ld: error: /var/folders/k8/31zw696n0b713wst4f3y3nnc0000gp/T/tinygo1882738107/main.o: undefined symbol: main.add
failed to run tool: wasm-ld
error: failed to link /var/folders/k8/31zw696n0b713wst4f3y3nnc0000gp/T/tinygo1882738107/main: exit status 1
make: *** [build] Error 1

I have go v1.19.2 and tinygo 0.27.0