Example dsss.conf entry leading to issue:
[plugins/echo.d]
type=library
shared
echo.so.0.0.0 is built and output to libplugins/ (which I had to create manually; the build died with an error until I did so), and symlinks are generated in the same directory, but targeted as if they were in ./. For example, libplugins/echo.so would have the target libplugins/echo.so.0.0.0, leading to the system attempting to access libplugins/libplugins/echo.so.0.0.0, which does not exist. Symlinking libplugins/ to libplugins/libplugins remedies the situation, if hackishly, so long as there are no further subdirectories containing other plugins.