Hallo Greg! / Hallo everybody! I called NI in Germany and they told me, that my problem is known but not solved ...
While searching through different directories I found two different places with the needed mesa library. To run the application I had to copy / link the files /usr/local/lib/Labview7-0/libLVMesaGL.so.3 and liblvrt.so.7.0 to /usr/lib. Trying other ones (e.g from /usr/loval/lv70 where they are also located) is not successful ... Now everything works fine ;-) Thanx for your help Greg! Helmut