libpng15 and libpng16's makefile.elf on Ubuntu fails with
"/usr/bin/ld:libpng.syms:2: syntax error in VERSION script"

The libpng.syms file is nearly empty:
$ cat libpng.syms
PNG15_15 {global:
local: *; };

makefile.elf is the only makefile that attempts to create and
use libpng.syms.

Both Ubuntu "12.04 LTS" and "14.04" exhibit this behavior.

Glenn