Thanks for taking care of that.
I am a bit lost at what is the cause of your problem.

I did the following tests on my development computer:

• CMAKE_INSTALL_PREFIX set to /home/some/path and doing ninja install would install the elisaLib.so private library to /home/some/path/lib/x86_64-linux-gnu/elisa/libelisaLib.so.0.1;

• adding DESTDIR=tmp ninja install would install in /tmp/home/some/path/lib/x86_64-linux-gnu/elisa/libelisaLib.so.0.1.

In my setup, without CMAKE_INSTALL_PREFIX, the install paths are wrong.

I will check the cmake documentation.

It might be caused by my default cmake parameters on my distro (Fedora):

/usr/bin/cmake \
        -DCMAKE_C_FLAGS_RELEASE:STRING="-DNDEBUG" \
        -DCMAKE_CXX_FLAGS_RELEASE:STRING="-DNDEBUG" \
        -DCMAKE_Fortran_FLAGS_RELEASE:STRING="-DNDEBUG" \
        -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON \
        -DCMAKE_INSTALL_PREFIX:PATH=/usr \
        -DINCLUDE_INSTALL_DIR:PATH=/usr/include \
        -DLIB_INSTALL_DIR:PATH=/usr/lib64 \
        -DSYSCONF_INSTALL_DIR:PATH=/etc \
        -DSHARE_INSTALL_PREFIX:PATH=/usr/share \
%if "lib64" == "lib64" 
        -DLIB_SUFFIX=64 \
%endif 
        -DBUILD_SHARED_LIBS:BOOL=ON

This is automatically set so that LIB_INSTALL_DIR is /usr/lib64.

I have found a working solution. See my inline comment. Do you want me to push a fix or are you able to do it directly ?

Do you want me to push a fix or are you able to do it directly ?

Yes please do it, I don't think I'm able to push.