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bug#14260: 24.3; build fails, undefined symbols _png_longjmp _png_set_lo


From: Eli Zaretskii
Subject: bug#14260: 24.3; build fails, undefined symbols _png_longjmp _png_set_longjmp_fn in image.o
Date: Wed, 24 Apr 2013 22:58:50 +0300

> Date: Wed, 24 Apr 2013 20:42:52 +0100
> From: Joe Corneli <address@hidden>
> 
> If I turn on png support when I build,
> 
>    Does Emacs use -lpng?...................................yes
> 
> then I get the appended error message.  Note, I just installed fontforge
> before rebuilding Emacs, and after Googling it seems that most of the
> messages involving the symbols in question are associated with that
> program.
> [...]
> Undefined symbols:
>   "_png_longjmp", referenced from:
>       _my_png_error in image.o
>   "_png_set_longjmp_fn", referenced from:
>       _png_load_body in image.o

My crystal ball says that you somehow donwgraded 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.





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