install.sh called in the SlackBuild creates an absolute symlink to a location inside /tmp/SBo at line 89:
Code:
ln -s "${THEME_DIR}"/preferences/32 "${THEME_DIR}"/preferences/22
This causes the name of the temporary directory to appear in the updated doinst.sh, triggering the test failure. Use sed or a patch to make it a relative symlink instead, and the problem should go away.