[MacPorts] #54070: libxml2 2.9.4: cannot cd to directory during install/configuration step

[MacPorts]

#54070: libxml2 2.9.4: cannot cd to directory during install/configuration step
----------------------+---------------------
 Reporter:  jkulesza  |      Owner:
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.4.1
 Keywords:            |       Port:  libxml2
----------------------+---------------------
 While attempting to install the root6 port, libxml2 needs to be installed.
 The process followed is:
 {{{
 9973 jkulesza at tempest[~]> sudo port install root6
 Password:
 --->  Computing dependencies for libxml2
 --->  Configuring libxml2
 Error: Failed to configure libxml2, consult
 /sw/var/macports/build/_sw_var_macports_sources_rsync.macports.org_release_tarballs_ports_textproc_libxml2/libxml2/work/libxml2-2.9.4/config.log
 Error: Failed to configure libxml2: configure failure: command execution
 failed
 Error: See
 /sw/var/macports/logs/_sw_var_macports_sources_rsync.macports.org_release_tarballs_ports_textproc_libxml2/libxml2/main.log
 for details.
 Error: Unable to execute port: upgrade cmake failed
 }}}

 See attached for the log file cited.

 This error occurs on two different computers (both OS X 10.11.6, one with
 rootless installation one with root/sudo privileges).  Both installations
 are to locations with nonstandard prefixes (this one to /sw and the other
 /local/macports).

 No maintainer is listed with the ticket because:
 {{{
 9976 jkulesza at tempest[~]> port info --maintainer libxml2
 maintainer:
 }}}

--
Ticket URL: <https://trac.macports.org/ticket/54070>
MacPorts <https://www.macports.org/>
Ports system for macOS