I m trying to compile source code, but receive: undefined reference to png_read_info’ File

Question

Asked: June 3, 20262026-06-03T04:10:48+00:00 2026-06-03T04:10:48+00:00

Im trying to compile source code, but receive: undefined reference topng_read_info’
File header:
#include “PngImage.hh”

#include <png.h>

#include <cstdio>
#include <csetjmp>
#include <cstring>

My compiler settings:
-I/usr/include/libxml2 -I/usr/include/osmpbf -O0 -g3 -Wall -c -fmessage-length=0 -lpng

What I`m doing wrong ?

Update:
I`m trying linking:
-I/usr/include/libxml2 -I/usr/include/osmpbf -O0 -g3 -Wall -c -fmessage-length=0 -L/usr/include/libpng -lpng

Library libpng already installed. Nothing change I receive again:
undefined reference topng_read_info

Fixed. My great mistake. I set compiler settings in eclipse instead of linker settings. Thank all for answers

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Editorial Team · Answer 1 · 2026-06-03T04:10:50+00:00

Editorial Team

You are not linking against libpng. Add -L/path/to/dir_containing/libpng -lpng to your link step.

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