CODEWITHSUNDEEP
opencvubuntu-16.04libpnglibjpeg
raggot
raggot

Reputation: 1012

How to update from libjpeg.so.8 to libjpeg.so.9 in Ubuntu 16.04?

Attempting to build an application based on OpenCV, I see two lines warning me of missing libraries for libjpeg and libpng. Here is an extract of the console output, which then goes on with a number of similar Qt-related issues.

/usr/bin/ld: warning: libjpeg.so.9, needed by /usr/local/lib/libopencv_imgcodecs.so, not found (try using -rpath or -rpath-link)
/usr/bin/ld: warning: libpng16.so.16, needed by /usr/local/lib/libopencv_imgcodecs.so, not found (try using -rpath or -rpath-link)
/usr/local/lib/libopencv_highgui.so: undefined reference to `QGraphicsView::viewportEvent(QEvent*)@Qt_5'
/usr/local/lib/libopencv_highgui.so: undefined reference to `QAbstractSlider::value() const@Qt_5'

Researching a bit around, I found out how to show which libraries and versions I have installed on my system using ldconfig -p | grep libjpeg and ldconfig -p | grep libpng. They gave me the following:

libjpeg.so.8 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libjpeg.so.8
libjpeg.so (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libjpeg.so
libpng12.so.0 (libc6,x86-64) => /lib/x86_64-linux-gnu/libpng12.so.0

and

libpng12.so.0 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libpng12.so.0
libpng12.so (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libpng12.so

I clearly see I have an issue. The libraries installed on my computer are older than those required by OpenCV. However, I tried sudo apt install libjpeg-dev, and to sudo apt update but I haven't found the newer version being available.

Upvotes: 2

Views: 6415

Answers (2)

Gaurav Sahadev
Gaurav Sahadev

Reputation: 51

For installing libjpeg9 Ubuntu 16.04 

$ sudo apt-get install libjpeg9-dev

Upvotes: 0

raggot
raggot

Reputation: 1012

This is how to install libjpeg9 on Ubuntu 16.04:

sudo apt install libjpeg9-dev

Upvotes: 3

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