Linux error while loading shared libraries: cannot open shared object file: No such file or directory

Program is part of the Xenomai test suite, cross-compiled from Linux PC into Linux+Xenomai ARM toolchain.

# echo $LD_LIBRARY_PATH                                                                                                                                          
/lib                                                                                                                                                             
# ls /lib                                                                                                                                                        
ld-2.3.3.so         libdl-2.3.3.so      libpthread-0.10.so                                                                                                       
ld-linux.so.2       libdl.so.2          libpthread.so.0                                                                                                          
libc-2.3.3.so       libgcc_s.so         libpthread_rt.so                                                                                                         
libc.so.6           libgcc_s.so.1       libstdc++.so.6                                                                                                           
libcrypt-2.3.3.so   libm-2.3.3.so       libstdc++.so.6.0.9                                                                                                       
libcrypt.so.1       libm.so.6                                                                                                                                    
# ./clocktest                                                                                                                                                    
./clocktest: error while loading shared libraries: libpthread_rt.so.1: cannot open shared object file: No such file or directory                                 

Edit: OK I didn’t notice the .1 at the end was part of the filename. What does that mean anyway?

Your library is a dynamic library.
You need to tell the operating system where it can locate it at runtime.

To do so,
we will need to do those easy steps:

1. Find where the library is placed if you don’t know it.

   sudo find / -name the_name_of_the_file.so
   

2. Check for the existence of the dynamic library path environment variable(LD_LIBRARY_PATH)

   echo $LD_LIBRARY_PATH
   

   If there is nothing to be displayed, add a default path value (or not if you wish to)

   LD_LIBRARY_PATH=/usr/local/lib
   

3. We add the desired path, export it and try the application.

   Note that the path should be the directory where the path.so.something is. So if path.so.something is in /my_library/path.so.something, it should be:

   LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/my_library/
   export LD_LIBRARY_PATH
   ./my_app
   

Reference to source