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Thread: How to tell GCC permanently where to find libraries in /usr/local

  1. #1
    Join Date
    Jun 2013
    Beans
    11

    How to tell GCC permanently where to find libraries in /usr/local

    I want to compile code using non standard libraries (e.g. openfst-libs) and do not want to specify the location of the libs every time I type g++.

    Greetings,
    Dree
    Last edited by DreeDrunk; June 6th, 2013 at 01:14 PM.

  2. #2
    Join Date
    Jun 2007
    Location
    Maryland, US
    Beans
    6,237
    Distro
    Kubuntu

    Re: How to tell GCC permanently where to find libraries in /usr/local

    When developers get tired of entering gcc/g++ on the command line with many options, they then to employ the use of a Makefile.

    However, since I understand that this query is related to our earlier discussion, I'll instruct you how to add /usr/local/lib (or any other location) to the system's library cache.

    All of the following steps require admin privileges; if you don't have them on your system then there's no point reading any further. To start...

    Code:
    # Elevate privileges
    #
    sudo -i
    
    # Goto the location where library cache configuration files are stored
    #
    cd /etc/ld.so.conf.d
    
    # Create a new file specifying /usr/local/lib
    #
    echo /usr/local/lib > local.conf
    
    # Update the system's library cache
    #
    ldconfig
    
    # log out
    #
    exit
    P.S. I do not have access to my Kubuntu system at the moment; the path to the library cache configuration files (/etc/ld.so.conf.d) may be different on your particular system. Right now my only reference is a Fedora 16 system.

    ---------

    EDIT:

    I have access to my (K)ubuntu system, and have verified that the path, /etc/ld.so.conf.d, is correct. There should be a file in that directory called 'libc.conf' containing the path /usr/local/lib. If this is true on your system, then disregard the instructions given above. There should be no need to augment the system's library path any further, since what you require will already be there. In case I'm wrong, just run "sudo ldconfig" to update the cache.
    Last edited by dwhitney67; June 5th, 2013 at 07:17 PM.

  3. #3
    Join Date
    Jun 2013
    Beans
    11

    Re: How to tell GCC permanently where to find libraries in /usr/local

    Thanks again dwhitney67! I ran the code you proposed earlier, so I do not know exactly if there was the line /usr/local/lib in the file 'libc.conf'. So GCC searches everytime in the right libraries. If I installed libs somewhere else then I had to do the things, that you proposed. So now I can link my libs to my liking.

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