%attr(755,root,root) %{_datadir}/mc/extfs/mcdic
%post mc
-grep mcdic %{mcextfs} &> /dev/null || echo -e "\n# dic disk catalogizer\nmcdic:\n" >> %{mcextfs}
+if [ -f %{mcextfs} ]; then
+ grep -q mcdic %{mcextfs} || echo -e "\n# dic disk catalogizer\nmcdic:\n" >> %{mcextfs}
+fi