ld||cannot find -lGL| after upgrade to 11.04

[trollger]

hi everyone.
I have been programming an OGRE project on Ubuntu 10.04 for some time now and yesterday I upgraded to 11.04. Now My CodeBlocks project complains:



ld||cannot find -lGL|
All the other libraries appear to work OGRE,CEGUI,OIS, and ODE all work.

I installed a driver and I have a working desktop so I am pretty sure it is safe to say openGL is somewhere on my computer. Is there a difference between Ubuntu 10 and 11 when it comes to this matter? any one have a solution?

[trollger]

Anyone? Should be an easy fix

[maverick280857]

I have the same problem, trying to compile CUDA SDK examples. In 10.10 Maverick Meerkat, it was possible to fix all this using


sudo apt-get install freeglut3 freeglut3-dev
sudo apt-get install libxi libxi-dev // This no longer works!
sudo apt-get install libxmu6 libxmu-dev

[maverick280857]

Found a fix at http://ubuntuforums.org/showpost.php?p=9285386&postcount=2


sudo ln -s /usr/lib/libGL.so.xx.xx.xx /usr/lib/libGL.so

This is what
ls -l /usr/lib/libGL.so* yields on my system:



lrwxrwxrwx 1 root root 27 2011-05-25 03:50 libGL.so -> /usr/lib/libGL.so.270.41.06
lrwxrwxrwx 1 root root 18 2011-05-05 14:20 libGL.so.1 -> libGL.so.270.41.06
-rwxr-xr-x 1 root root 1008272 2011-05-05 14:20 libGL.so.270.41.06


Hope this helps.

[salemboot]

Did anyone submit a bug report?

[Qdoba]

Found a fix at http://ubuntuforums.org/showpost.php?p=9285386&postcount=2


sudo ln -s /usr/lib/libGL.so.xx.xx.xx /usr/lib/libGL.soThis is what
ls -l /usr/lib/libGL.so* yields on my system:



lrwxrwxrwx 1 root root 27 2011-05-25 03:50 libGL.so -> /usr/lib/libGL.so.270.41.06
lrwxrwxrwx 1 root root 18 2011-05-05 14:20 libGL.so.1 -> libGL.so.270.41.06
-rwxr-xr-x 1 root root 1008272 2011-05-05 14:20 libGL.so.270.41.06
Hope this helps.

Just to clarify, you need to find the library you actually have (in this case libGL.so.270.41.06 and force link to that. So in this case it would be:


sudo ln -s -f /usr/lib/libGL.so.270.41.06 /usr/lib/libGL.so
Do a
ls -l /usr/lib/libGL.so* on your system to find the right one. And then afterwards the link should be blue->green colors instead of red (red means broken link). Thank you Maverick!

[MadCow108]

this is terrible advice.
You should never touch anything the package manager manages under /usr (excluding /usr/local)

the libGL.so symlink is provided by libgl1-mesa-dev
see http://packages.ubuntu.com/search?searchon=contents&keywords=libGL.so&mode=exactfilename&suite=natty&arch=any
note this is just the symlink for linking. It is only needed during buildtime has nothing to with which library is used at runtime.

the actually used library GL is managed via the alternatives system and depends on your graphics card and driver.
To change it do:

update-alternatives --config gl_conf
# or if its multiarched
update-alternatives --config $(dpkg-architecture -qDEB_HOST_MULTIARCH)_gl_conf
or use the gui galternatives.