ldd can't find library - c++

Question

I've already read this, this and this.
I've installed OpenCV in a costum path /home/luca/ParallelOpenCV/install_icpc/lib, where there is libopencv_core.so:
luca#jarvis:~$ ldd /home/luca/ParallelOpenCV/install_icpc/lib/libopencv_core.so
linux-vdso.so.1 => (0x00007ffccb389000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f46af719000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f46af410000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f46af1f2000)
librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f46aefea000)
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f46aedd0000)
libimf.so => /opt/intel/compilers_and_libraries_2017.1.132/linux/compiler/lib/intel64/libimf.so (0x00007f46ae8e3000)
libsvml.so => /opt/intel/compilers_and_libraries_2017.1.132/linux/compiler/lib/intel64/libsvml.so (0x00007f46ad9d8000)
libirng.so => /opt/intel/compilers_and_libraries_2017.1.132/linux/compiler/lib/intel64/libirng.so (0x00007f46ad663000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f46ad2e0000)
libiomp5.so => /opt/intel/compilers_and_libraries_2017.1.132/linux/compiler/lib/intel64/libiomp5.so (0x00007f46acf3d000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f46acd27000)
libintlc.so.5 => /opt/intel/compilers_and_libraries_2017.1.132/linux/compiler/lib/intel64/libintlc.so.5 (0x00007f46acabc000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f46ac6f3000)
/lib64/ld-linux-x86-64.so.2 (0x000055f67574e000)
I added the path to LD_LIBRARY_PATH and I executed ldconfig, but:
luca#jarvis:~$ ldd libopencv_core.so
ldd: ./libopencv_core.so: No such file or directory
What am I missing?

Answer 1

From man ldd:-
NAME
ldd - print shared object dependencies
SYNOPSIS top
ldd [option]... file...
DESCRIPTION
ldd prints the shared objects (shared libraries) required by each
program or shared object specified on the command line. An example
of its use and output is the following:
$ ldd /bin/ls
linux-vdso.so.1 (0x00007ffcc3563000)
libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f87e5459000)
libcap.so.2 => /lib64/libcap.so.2 (0x00007f87e5254000)
libc.so.6 => /lib64/libc.so.6 (0x00007f87e4e92000)
libpcre.so.1 => /lib64/libpcre.so.1 (0x00007f87e4c22000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f87e4a1e000)
/lib64/ld-linux-x86-64.so.2 (0x00005574bf12e000)
libattr.so.1 => /lib64/libattr.so.1 (0x00007f87e4817000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f87e45fa000)
The output of your command:
luca#jarvis:~$ ldd libopencv_core.so
ldd: ./libopencv_core.so: No such file or directory
says that the program or shared object supposedly specified on the
commandline does not exist in the implied directory = ./ = /home/luca.
We know it exists in /home/luca/ParallelOpenCV/install_icpc/lib.
If you run ldd file, where file, after shell expansion, is the pathname
of an existing file, then ldd will display the dynamic dependencies
of that file, as discovered by the dynamic linker with its usual reliance upon
the current ldconfig configuration and its usual regard to the operative
LD_LIBRARY_PATH environment setting. It will not search your system
for files that might be alternate candidates for a file that does not exist
and display the dynamic dependencies of those candidates.