Sorry to bother you again.But I get another error after that I have solve the problem about rsync's activation.So I need your help.
---> Attempting to fetch git-htmldocs-1.9.2.tar.gz from http://jog.id.distfiles.macports.org/macports/mpdistfiles/git-core
---> Verifying checksums for git-core
---> Extracting git-core
---> Applying patches to git-core
---> Configuring git-core
---> Building git-core
Error: org.macports.build for port git-core returned: command execution failed
Error: Failed to install git-core