Can not link to shared libraries with LD_LIBRARY_PATH.

[Helcio Wagner]

 Hi, gentlemen.

   I am using gcc 4.6.3 on Ubuntu 12.04. 

   First of all, I have no LD_LIBRARY_PATH environment variable set. Should I have it?

   Well, I've edited '.bashrc' file to define LD_LIBRARY_PATH and pointed it to '/usr/lib' and '/usr/local/lib' directories:

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

   My executable (named 'test') needs to be linked to two shared libraries to be generated: 'libncx.so.2.2' and 'libagt.so.2.2'. Both are located on '/usr/lib' directory. However, when I type 'gcc -Wall test2.c', there is a message relating undefined references. The executable was not generated.

   Indeed, I must provide the full path to those libraries, i.e., 'gcc -Wall teste2.c /usr/lib/libncx.so.2.2 /usr/lib/libagt.so.2.2' in order to create the executable. I don't understand that, because they are located on default library search path.

   Does somebody help me to clarify that point? Thanks in advance.   

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HELCIO WAGNER DA SILVA