these 4 derivations will be built:
  /nix/store/cqalnav1gwzgnq476b33kfrangdw90x2-clan-cli-source.drv
  /nix/store/259fyp8rnx7b67a45wshach1wkyky1ib-clan-cli.drv
  /nix/store/gdcd0bf68wraw2isacj2cfjhl38dn7h1-closure-info.drv
  /nix/store/h5zifwd3swbayzwsxi439sinvidhni6p-check-vars.drv
error: path '/nix/store/q2q2h6w9l85jk5gxhjash4wsaiqqaxy5-check-vars' is not valid
error: Cannot build '/nix/store/h5zifwd3swbayzwsxi439sinvidhni6p-check-vars.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/q2q2h6w9l85jk5gxhjash4wsaiqqaxy5-check-vars