bug#19831: 25.0.50; Can't build emacs 25.0.5 with libpng16 support (only libpng15)

[Tory S. Anderson]

I have libpng16 (and 15) installed with dev files; my libpng.so points to 
version 16. But emacs 25.0.5 refuses to work with 16. Although the config log 
is full of references to lpng16, it seems to choose to load with lib15 (and 
won't build with png support if I don't make v 15 available). This is breaking 
other programs that expect to be using the latest libpng on the computer.

Emacs will not allow me to build with png support if I do not have 
`/usr/lib64/libpng15.so', despite existence of libpng.so in the same location. 
The linked logs are divided into no-png when I do NOT have libpng15.so at that 
location, and yes-png when I DO have libpng15.so at that location.

Note the following when things work:
$ whereis libpng
libpng: /usr/lib64/libpng15.so /usr/lib64/libpng16.so /usr/lib64/libpng.so 
/usr/local/lib/libpng16.a /usr/local/lib/libpng.a /usr/local/lib/libpng.la 
/usr/local/lib/libpng16.so /usr/local/lib/libpng.so /usr/local/lib/libpng16.la 
/usr/share/man/man3/libpng.3.gz

There is, of course, no libpng15.so there in the fail cases.

Download the four logs in the following archive:
http://toryanderson.com/files/25pngerrors.tar.gz

This is on Fedora 20 64-bit. 



In GNU Emacs 25.0.50.4 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.9)
 of 2015-02-10 on localhost.localdomain
Repository revision: df1e4ea210c081c969e092628aa999b1a4d59dfd
Windowing system distributor `Fedora Project', version 11.0.11404000
System Description:     Fedora release 20 (Heisenbug)

Configured features:
XPM JPEG TIFF GIF PNG SOUND GSETTINGS NOTIFY GNUTLS FREETYPE XFT ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Shell

Minor modes in effect:
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  line-number-mode: t

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slime-autoloads tablist-autoloads zenburn-autoloads package epg-config
server time-date tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image
regexp-opt fringe tabulated-list newcomment elisp-mode lisp-mode
prog-mode register page menu-bar rfn-eshadow timer select scroll-bar
mouse jit-lock font-lock syntax facemenu font-core frame cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
minibuffer cl-preloaded nadvice loaddefs button faces cus-face
macroexp files text-properties overlay sha1 md5 base64 format env
code-pages mule custom widget hashtable-print-readable backquote
make-network-process gfilenotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)

Memory information:
((conses 16 694949 19193)
 (symbols 48 60703 0)
 (miscs 40 2203 4656)
 (strings 32 145222 19078)
 (string-bytes 1 4621896)
 (vectors 16 52754)
 (vector-slots 8 893495 10272)
 (floats 8 647 592)
 (intervals 56 24476 0)
 (buffers 976 39)
 (heap 1024 76505 3900))