Failed to install libpng

[DGDanforth (Douglas G Danforth)]

I have found two other tickets with the above title but the claim is the problem was fixed. It is not for me. I am running on OS X Lion (can not up grade due to 2006 hardware limitation). Xcode if 4.6.3

Here is the log file for libpng

version:1
:debug:main changing euid/egid - current euid: 0 - current egid: 0
:debug:main egid changed to: 501
:debug:main euid changed to: 502
:debug:main Executing org.macports.main (libpng)
:debug:main Privilege de-escalation not attempted as not running as root.
:debug:main Skipping completed org.macports.archivefetch (libpng)
:debug:main Privilege de-escalation not attempted as not running as root.
:debug:main Skipping completed org.macports.fetch (libpng)
:debug:main Privilege de-escalation not attempted as not running as root.
:debug:main Skipping completed org.macports.checksum (libpng)
:debug:main Privilege de-escalation not attempted as not running as root.
:debug:main Skipping completed org.macports.extract (libpng)
:debug:main Privilege de-escalation not attempted as not running as root.
:debug:main Skipping completed org.macports.patch (libpng)
:debug:main Privilege de-escalation not attempted as not running as root.
:debug:configure configure phase started at Tue Oct 25 18:05:48 PDT 2016
:notice:configure --->  Configuring libpng
:debug:configure Using compiler 'Xcode Clang'
:debug:configure Executing org.macports.configure (libpng)
:debug:configure Environment:
CC='/usr/bin/clang'
CC_PRINT_OPTIONS='YES'
<_release_tarballs_ports_graphics_libpng/libpng/main.log" [readonly] 76L, 5115C

[larryv (Lawrence Velázquez)]

This looks like you copied the text out of a Vim window.

Please run sudo port clean libpng, try installing again, and attach the log file.