libpng-1.6.11beta05 is available from
ftp://ftp.simplesystems.org/pub/png-group/src/libpng16
and from
http://libpng.sf.net

Version 1.6.11beta05 [April 26, 2014]
  Do not reject ICC V2 profiles that lack padding (Kai-Uwe Behrmann).
  Relocated closing bracket of the sRGB profile test loop to avoid getting
    "Not recognizing known sRGB profile that has been edited" warning for
    ICC V2 profiles that lack the MD5 signature in the profile header.

Glenn