1

I installed a long time ago the libpng12-dev package with the apt-get command. It installed libpng-1.2.54.

But now I have a project that require the libpng-1.6.16 version. Since it's not available on a ppa I did the following :

  • I uninstalled the libpng12-dev library, with apt-get remove

  • I installed the new library manually

But when I executed my program it's still tells me taht it's using the 1.2.54 version. So I checked some few sthing and it seems that the library is still installed :

$identify -list format | grep PNG

prints

MNG* PNG       rw+   Multiple-image Network Graphics (libpng 1.2.54)
      PNG* PNG       rw-   Portable Network Graphics (libpng 1.2.54)

or

$ apt-cache policy libpng12-dev

prints 

libpng12-dev:
  Installed: (none)
  Candidate: 1.2.54-1ubuntu1
  Version table:
     1.2.54-1ubuntu1 500
        500 http://fr.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

and

$ apt-cache policy libpng12-0

prints

libpng12-0:
  Installed: 1.2.54-1ubuntu1
  Candidate: 1.2.54-1ubuntu1
  Version table:
 *** 1.2.54-1ubuntu1 500
        500 http://fr.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status

Is it possible to redirect the program to use the good library at run time? Or to change the configuration to use the last installed version instead?

Nick Weinberg
  • 4,596
BaptisteL
  • 111

1 Answers1

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Undo your manual installation, and install the libpng 1.6 version which comes with Ubuntu:

apt-get install libpng16-16
zwets
  • 12,354
  • Thank you for your answer, but unfortunately that didn't fix the problem. I managed to solve it by compiling the project with my local library http://stackoverflow.com/questions/5544445/libpng-warning-incompatible-libpng-version-in-application-and-library. But yet it's not really what I was looking for. I still can't see why it keeps linking me to the oldest version. I also tried editing my LD_LIBRARY_PATH but that didn't change anything. – BaptisteL Oct 27 '16 at 13:34