Juan Manuel Palacios <jmpp@macports.org> writes:

This is a new feature in MacPorts 1.5.1 to detect violations of the pre-established hierarchy that governs the ${prefix} tree, so as to keep a sense of order when installing software. In order to minimize conflicts with the bundled Apache, Apache 2 installs its entire world onto its own prefix within MacPorts' ${prefix}, ${prefix}/apache2/ {bin,lib,include,<etc>}, so that its files are not readily found by a default configured shell; this setup violates the default hierarchy and thus produces the error you saw when upgrading to MacPorts 1.5.1. I just added and committed workaround to the Portfile to indicate the violation is intended in this case, "destroot.violate_mtree yes". Please re-sync your tree in about half an hour from this posting and try installing again, report back to me if you still experiencing the same problem.

I may have missed a previous discussion, but can someone describe exactly what conditions violate the mtree guidelines? Mark