A few weeks ago i upgraded to Mavericks (10.9)...so far, so good.
But i had some trouble with my MacPorts installation...
:info:configure CMake Error at Modules/Platform/Darwin.cmake:211 (message): :info:configure CMAKE_OSX_DEPLOYMENT_TARGET is '10.9' but CMAKE_OSX_SYSROOT: :info:configure :info:configure "" :info:configure :info:configure is not set to a MacOSX SDK with a recognized version. Either set :info:configure CMAKE_OSX_SYSROOT to a valid SDK or set CMAKE_OSX_DEPLOYMENT_TARGET to :info:configure empty.
On https://trac.macports.org was this problem already reported but without any solutions that worked for me. So i did my own research and i ended up with a really dirty workaround.
Create a list of all installed ports (incl. variants)
sudo port -qv installed
Uninstall all ports
sudo port -f uninstall installed
Clean any builds
sudo port clean all
Reinstall all necessary ports
port install +variant1
Yeah...it's not the best... i know!