There is no need to install cal separately. Actually cal dll (libaticalrt.so, libbaticalcl.so & etc )comes with catalyst driver itself & they are in /usr/lib folder.
Could you test LD_LIBRARY_PATH.
try echo $LD_LIBRARY_PATH.
it must contane path to aticalrt
If it is not contane, add path. by export $LD_LIBRARY_PATH;$LD_LIBRARY_PATH
or add to ld.so.conf and do ldconfig.
More detailes you could find in installation notes of sdk.