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Old 10-27-2010, 04:01 PM   #1
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Problem with libpng

Hey guys. Seems like I'm having a problem with libpng. I've created a simple SDL app and last night it worked perfectly. Today, I tried it out again and it gave me this error.
libpng warning: Application was compiled with png.h from libpng-1.4.3
libpng warning: Application  is  running with png.c from libpng-1.2.44
libpng error: Incompatible libpng version in application and library
I didn't mess with anything related to libpng and I'm not sure what the problem is. I didn't even know I had libpng-1.2.44 installed. I'm not sure if this is an SDL_image problem or libpng or if it's just my path is wrong. Any help is appreciated.
Old 10-28-2010, 12:46 PM   #2
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It sounds like there was mixed libraries - perhaps another version of libpng on the box that compiled the thing.
Old 10-28-2010, 12:46 PM   #3
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You can run
ldd /path/to/SDL-app |grep libpng
to see where your application finds libpng.
If for example it uses libpng-1.2.44 from /usr/lib and you want to use libpng-1.4.3 that resides in /usr/local/lib, you can use (for bash)
export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
before running your application.


Last edited by bathory; 10-30-2010 at 05:43 PM.
Old 11-08-2010, 10:12 PM   #4
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AH! I am so sorry. I found out what the problem was and forgot about this post. I forgot I had configured SDL_image to work with a different version of libpng directly in the source to make it compatible with an older machine I had and accidentally used that source code instead of the mainstream. I apologize for my stupid mistake and thank you for your help.


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