Migrate PVCS to RTC

I think you wold have to do a two step approach..

PVCS to SVN, SVN to RTC.

I found at least one PVCS to SVN migration tool, never done it, not recommending the tool, just a quick search

https://www.polarion.com/products/svn/svn_importer

I am not a fan of bringing the whole history over. Since the systems operate by very different approaches the results can be surprising. A better way from my perspective is to keep the old history in the old tool, migrate some baselines and restructure.

Keep the old system available for reference but gradually reduce accessibility to the old system. If no one complains about wanting to see the history any longer, backup and mothball the old system if needed.

Otherwise Sam's suggestion is one approach. another is to use the SCM commandline or some other API based tools to do this.