Error during building: prost-build v0.7.0, The PROTOC environment variable is not set

[adamvm]

pi@pi4:~/automata $ cargo build --release
Compiling sct v0.6.0
Compiling webpki v0.21.4
Compiling wasm-timer v0.2.5
Compiling rw-stream-sink v0.2.1
Compiling soketto v0.4.2
Compiling yamux v0.8.1
Compiling libp2p-pnet v0.20.0
Compiling intervalier v0.4.0
Compiling futures-diagnose v1.0.1
Compiling exit-future v0.2.0
Compiling prost-build v0.7.0
error: failed to run custom build command for prost-build v0.7.0

Caused by:
process didn't exit successfully: /home/pi/automata/target/release/build/prost-build-0f2fe0256215a37a/build-script-build (exit code: 101)
--- stderr
thread 'main' panicked at 'Failed to find the protoc binary. The PROTOC environment variable is not set, there is no bundled protoc for this platform, and protoc is not in the PATH', /home/pi/.cargo/registry/src/github.com-1285ae84e5963aae/prost-build-0.7.0/build.rs:100:10
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace
warning: build failed, waiting for other jobs to finish...
error: build failed
pi@pi4:~/automata $

[adamvm]

gabrielrussoc/prost-build#1 filled

[ashWhiteHat]

I use alpine and fix with.

apk add protoc