Please don't set the milestone field for port bugs, avoid setting priority to high (MacPorts developers will do that for you if necessary) and Cc the maintainer, if any. Also, try to preview your post and use WikiFormatting in Trac.
Usually, we ask you to attach the main.log of a clean build (which you didn't), but this seems to be pretty clear: A 3rd-party installer installed a /Library/Frameworks/libcurl.framework on your machine that's i386 only, but you're building x86_64 cmake. As per our wiki:FAQ#buildfails, clean and try again in trace mode (port -t). If that doesn't help, move or delete libcurl.framework in /Library/Frameworks.
