can't upgrade py27-zmq

[Comer Duncan]

I have today run across a failure to update py27-zmq.  The output seems
non-instructive so I am hoping to get some help.  I paste the output of my
attempt here:

comermacpro:MarkFiniteDiffDerivativs comerduncan$ sudo port upgrade py27-zmq
--->  Scanning binaries for linking errors: 100.0%
--->  Found 12 broken file(s), matching files to ports
--->  Found 1 broken port(s), determining rebuild order
--->  Rebuilding in order
     py27-zmq @14.1.1
--->  Computing dependencies for py27-zmq
--->  Cleaning py27-zmq
--->  Scanning binaries for linking errors: 100.0%
--->  Found 12 broken file(s), matching files to ports
--->  Found 1 broken port(s), determining rebuild order
--->  Rebuilding in order
     py27-zmq @14.1.1
--->  Computing dependencies for py27-zmq
--->  Fetching distfiles for py27-zmq
--->  Verifying checksums for py27-zmq
--->  Extracting py27-zmq
--->  Configuring py27-zmq
--->  Building py27-zmq
Error: org.macports.build for port py27-zmq returned: command execution
failed
Please see the log file for port py27-zmq for details:

/opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_ports_python_py-zmq/py27-zmq/main.log
Error: Unable to upgrade port: 1
Error rebuilding py27-zmq
    while executing
"error "Error rebuilding $portname""
    (procedure "revupgrade_scanandrebuild" line 382)
    invoked from within
"revupgrade_scanandrebuild broken_port_counts $opts"
    (procedure "macports::revupgrade" line 5)
    invoked from within
"macports::revupgrade $opts"
    (procedure "action_revupgrade" line 2)
    invoked from within
"action_revupgrade $action $portlist $opts"
    (procedure "action_upgrade" line 25)
    invoked from within
"$action_proc $action $portlist [array get global_options]"
    (procedure "process_cmd" line 93)
    invoked from within
"process_cmd $remaining_args"
    invoked from within
"if { [llength $remaining_args] > 0 } {

    # If there are remaining arguments, process those as a command
    set exit_status [process_cmd $remaining..."
    (file "/opt/local/bin/port" line 4857)

Thanks for your help!!

Comer
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