This is expected: cleartool is from a full ClearCase installation, which you don't have.
CCRC is a lightweight ClearCase installation, a client talking to a CCRC server through web request only.
You can try and use rcleartool
, but I don't know if this will be compatible with the Hudson ClearCase plugin: if that plugin tries to create a snapshot or dynamic view, it won't work, since CCRC uses only web views (like snapshot view, but with slightly different parameters at the creation).
Support for CCRC is still pending (JENKINS-5192).