Unable to rename directory oldpath to newpath: [ec:OS error message]
In the process of committing build outputs to disk (here, renaming a directory from its original name to a new name), Electric Make (eMake) was unable to rename a directory. The OS error message provides the specific cause of the failure.
Because the error involves an external system in this context (the filesystem on the eMake host), the list of possible causes for this error is virtually limitless: a corrupted filesystem; hardware failure; insufficient permissions; and so on. Refer to the specific OS error message to determine the cause of the failure.
The fix depends on the cause of the error.