The output says:
ld: warning: in /opt/local/lib/libXext.dylib, file is not of required architecture
ld: warning: in /opt/local/lib/libX11.dylib, file is not of required architecture
ld: warning: in /opt/local/lib/libXdmcp.dylib, file is not of required architecture
Of what architecture are those files? You can use "lipo -info" to find out.
For what architecture are you now trying to build? Are you building universal? What are your build_arch and universal_archs settings in macports.conf?
What version of Xcode and Mac OS X?
