Build Failure on ports-10.6_x86_64: alembic, boost, libarchive, usd

[buildbot at macports.org]

Status:       Failure
Build slave:  ports-10.6_x86_64
Full logs:    https://build.macports.org/builders/ports-10.6_x86_64-watcher/builds/12682
Build reason: The SingleBranchScheduler scheduler named 'ports' triggered this build
Port list:    usd
Subport list:
	- usd
Variants:     None
Revision:     370dafef40932d2a53303c40d4c09ae3f6f28c8b
Build time:   0:02:49
Author:       Jason Liu <jasonliu-- at users.noreply.github.com>

Log from failed builds:
	Building 'usd' ... [ERROR] (failed to install dependency 'libarchive')
	> maintainers: toby at macports.org.
	Building 'usd' ... [ERROR] (failed to install dependency 'alembic')
	> maintainers: .
	Building 'usd' ... [ERROR] (failed to install dependency 'boost')
	> maintainers: michaelld at macports.org.

Broken ports:
	- alembic
	- boost
	- libarchive
	- usd

Responsible maintainers:
	- michaelld at macports.org
	- toby at macports.org

Links to individual build jobs:
- ports-10.6_x86_64-builder #40641
  https://build.macports.org/builders/ports-10.6_x86_64-builder/builds/40641

-- 
Best regards,
MacPorts Buildbot
https://build.macports.org/