On the rococo_v1 tag (and probably on master) when I do a clean checkout and build the collator with cargo build --release -p rococo-collator, the command fails with the following (full error):

error: failed to run custom build command for `westend-runtime v0.8.22 (https://github.com/paritytech/polkadot?branch=rococo-branch#e9164236)`

Running the exact same command without changing anything succeeds the second time.