While trying to install the fixpack for Tivoli Directory Integrator I got the following message:
"the installc executable launcher was unable to locate its companion shared library"
The reason was some incompatibility with the network share where the installation sources were located. They were mounted via NFS from an EMC Isilon SAN device. After we copied the installation sources from the EMC Isilon to a NetApp device and shared it from there, everything worked without problems.
Another solution would be to copy the installation sources to a local drive and start installation from here.
Unfortunately we were not able to find the root cause of the problem (means, the configuration issue on the EMC Isilon share).