Ubuntu – Use shared libraries in /usr/local/lib

librariesUbuntu

I have build some libraries from sources, and the files after make install are in /usr/local/lib

For example, in my case I have the file libodb-2.2.so which is in this directory.

However when I launch the executable that has linked with libodb, I got the error: error while loading shared libraries: libodb-2.2.so: cannont open shared object file: No such file or directory.

Does it mean that I have build my executable not correctly ? or should I indicate the system that there may be some interesting libs in the folder /usr/local/lib also ?

I'm using Ubuntu 12.04, Linux kernel 3.2.0-38-generic.

Best Answer

For the current session you can

export LD_LIBRARY_PATH=/lib:/usr/lib:/usr/local/lib

or to make the change permanent you can add /usr/local/lib to /etc/ld.so.conf (or something it includes) and run ldconfig as root.

If you're still having problems, running ldd [executable name] will show you the libraries it's trying to find, and which ones can't be found.

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Unable to launch Firefox: keeps on crashing

Although I am using Arch Linux and not CentOS, in case it helps, I encountered a similar issue with a recent upgrade of firefox (to 33.0.2). The problem looked like a simple case of dependencies that somehow did not get handled properly by the package manager.

The initial problem I encountered when I updated firefox and tried to start it was

XPCOMGlueLoad error for file /usr/lib/firefox/libxul.so:
libicui18n.so.54: cannot open shared object file: No such file or directory
Couldn't load XPCOM.

I tracked down that libicui18n.so.54 is in the icu (International Components for Unicode library) package, so I updated that package. I then tried to start firefox and got

XPCOMGlueLoad error for file /usr/lib/firefox/libxul.so:
/usr/lib/libnss3.so: version `NSS_3.16.2' not found (required by /usr/lib/firefox/libxul.so)
Couldn't load XPCOM.

So, I tracked down that libnss3.so is in the nss (Mozilla Network Security Services) package, so I updated that package too.

Then everything worked.

LibGLEW.so.1.11: cannot open shared object file

You need to instruct your system where to find dynamic libraries. System-wide directories like /usr/lib are in the default search path for dynamic libraries, but if you want to add custom directories, you need to declare them by listing them in the environment variable LD_LIBRARY_PATH. This is a colon-separated list of directories, like PATH.

export LD_LIBRARY_PATH=/home/mks/myGL/oglpg/lib

Put this line in your ~/.profile or wherever you define environment variables. You can also run it in a shell and it'll apply to all programs started from that shell.

Alternatively, when you build a program using the library, register its location on your system.

g++ -Wl,-rpath,/home/mks/myGL/oglpg/lib … -L /home/mks/myGL/oglpg/lib -lGLEW

The chapter on shared libraries in the Program Library Howto may be of additional help.

Best Answer

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Unable to launch Firefox: keeps on crashing

LibGLEW.so.1.11: cannot open shared object file

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