Which dependency list to build first?

The package will not load. The only reason to do test load is to examine
why the package's .so file cannot be loaded. We know there is at least one
function or data symbol that it cannot find, __atomic_fetch_add_8, which
may be from boost::atomic. The ldd command may give some hints about
missing libraries.

Bill,

Yes, it does. libR.so is not found:
# ldd later.so
 	linux-gate.so.1 (0xb76df000)
 	libR.so => not found

However, R runs and libR.so is found here:
/usr/lib/R/lib/libR.so
and was last accessed
-rwxr-xr-x 1 root root 3331940 Dec 23 10:00 /usr/lib/R/lib/libR.so*

Should I rebuild and reinstall R-3.5.2?

Thanks again,

Rich