The shiftcolumn plugin does not compile in current SVN revisions since the sciwrappers.h got removed from installation.
GCC claimed, the sciwrappers.h was not found anymore. I've removed the inclusion of sciwrappers.h in shiftcolumn.c
and could compile the plugin successful. The behaviour of the plugin is still the same so, I assume the attached patch will
fix this issue.
By the way: the shiftcolumn plugin is missing here in the SF tracker as Category.