CarbonHeaders obsolete: uninstall dependencies

[Tim Johnson]

MacPorts base version 2.3.3 on OS X 10.7
----------------------------------------
When executing
  sudo port upgrade outdated
I get the following message :
  Error: CarbonHeaders is an obsolete port.  Please uninstall it
When executing
  sudo port uninstall CarbonHeaders
I get the following message :
  Error: org.macports.uninstall for port CarbonHeaders returned:
  Please uninstall the ports that depend on CarbonHeaders first
and (in part)
  --->  Unable to uninstall CarbonHeaders @18.1_2, the following
  ports depend on it:
  --->  	libunwind-headers @35.3_0

Since I have only entry - level knowledge of macports, and I don't
wish to do "damage" I'm must ask :

Is this just a matter of running 
  sudo port libunwind-headers ?
and then
  sudo port uninstall CarbonHeaders ?

thanks  
-- 
Tim 
tim at tee jay forty nine dot com or akwebsoft dot com
http://www.akwebsoft.com, http://www.tj49.com