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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.

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2 Answers 2

up vote 6 down vote accepted

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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If you've already run ldconfig after building the library, keep reading. If not, read aboout ldconfig first.

/usr/local/lib might not be in the library path that ldconfig uses. You can just do this:

ldconfig /usr/local/lib

And the stuff should be added to the linker cache, but it is probably better to add the path properly. Make sure you have a /etc/ld.so.conf.d directory. If so add a file (call it "usr-local.conf", or whatever), and put one line in it:


Now run ldconfig. If you don't have the ld.so.conf.d directory, you should have a /etc/ld.so.conf file and you can add that line to the end of it.

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I've added a custom.conf file to /etc/ld.so.conf.d then sudoed ldconfig to take it into account and my executable can start now. –  Stephane Rolland Mar 13 '13 at 14:17

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