Getting git clone to work between MacPorts installations

If you use MacPorts to install git, then the various git programs (git, gitk, etc.) will be installed in MacPorts’ usual /opt/local/bin directory. This, however, seems to screw up the git clone operation which complains about not finding the git-upload-pack binary.
Trying the –upload-pack option to pass in a nonstandard location for the upload-pack binary on [...]