[MacPorts] #38918: Building Emacs fails - downgraded libpng?

[MacPorts]

#38918: Building Emacs fails - downgraded libpng?
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 Reporter:  holtzermann17@…  |      Owner:  macports-tickets@…
     Type:  defect           |     Status:  new
 Priority:  Normal           |  Milestone:
Component:  ports            |    Version:  2.1.3
 Keywords:                   |       Port:
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 After my attempt to build Emacs 24.3 from source failed, Eli Zaretski
 commented to me:

 > My crystal ball says that you somehow downgraded your libraries to a
 libpng version older than 1.5, while the headers are still for 1.5. These
 functions are needed by Emacs for libpng 1.5 or later.

 Indeed,

 sudo port uninstall libpng

 shows that I had 4 versions installed (1.4.7_0, 1.4.8_0, 1.4.12_0, and
 1.5.15_0 - which is designated as "active").  I uninstalled these earlier
 versions along with all libpng support that had been installed with fink
 -- but I still get the same error message when I try to build Emacs.

  Undefined symbols:
    "_png_longjmp", referenced from:
        _my_png_error in image.o
    "_png_set_longjmp_fn", referenced from:
        _png_load_body in image.o

 The Emacs bug report is here.
 http://lists.gnu.org/archive/html/bug-gnu-emacs/2013-04/msg00593.html

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Ticket URL: <https://trac.macports.org/ticket/38918>
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